[Skip to main content](#vessel-content) # URGENT: Prices are not displayed — issue with Price Calculations ## - **[Reincidente](/forum/user/12307-reincidente "View Reincidente's Profile")** - [![Reincidente's Avatar](https://www.hikashop.com/media/kunena/core/svg/person.svg)](/forum/user/12307-reincidente "View Reincidente's Profile") Topic Author - [ Offline](/forum/user/12307-reincidente) Less More - Posts: 467 - Thank you received: 21 - 7 months 3 weeks ago [\#370848](#370848) by [Reincidente](/forum/user/12307-reincidente "View Reincidente's Profile") *[URGENT: Prices are not displayed — issue with Price Calculations](/forum/25-install-update/910190-urgent-prices-are-not-displayed---issue-with-price-calculations#370848 "Hi Nicolas, After updating to HikaShop 6.4.0, I’m facing a critical issue: on some product pages the price is not displayed on screen when the price depends on HikaShop – Price Calculations (price computed from custom fields such as width/height/quantity/shape). What happens The calculation is triggered (an XHR request returns HTTP 200), but the price never renders. The browser console shows: Uncaught TypeError: Cannot read properties of null (reading 'price') Triggered inside the xhr.onreadystatechange callback (hikashop.js). Technical evidence (Network/XHR) In Network → XHR there is a request named calculate returning: Response: No product id And in Payload / Form data, only these parameters are sent: {"cart_type":"cart","add":"1","ctrl":"product","task":"updatecart","return_url":"aHR0cHM6Ly93d3cuaGVybWFub3NnYWxpYW5vLmVzL2NvbXByYXIvZXRpcXVldGFzLXBlcnNvbmFsaXphZGFz"} As you can see, product_id is not being sent. DOM evidence In Elements, I can see: This span is empty (no ID inside), so the AJAX/calculation flow cannot retrieve the product_id and the request ends with “No product id”. Then the JS tries to read .price and crashes. Important notes This does not affect all products: it happens only on products where the price is calculated using Price Calculations with custom fields. Products with a “normal” price (no calculation) are not affected. Example URL www.hermanosgaliano.es/comprar/etiquetas-personalizadas Request Could you please confirm if this is a regression in 6.4.0 and provide a patch? It looks like the issue is that product_id is not injected into the DOM (or is not being read properly) when building the calculate/updatecart request. Thank you in advance — this is urgent because it directly impacts conversions. Best regards, José Ángel Hermanos Galiano")* was created by *[Reincidente](/forum/user/12307-reincidente "View Reincidente's Profile")* Hi Nicolas, After updating to HikaShop 6.4.0, I’m facing a critical issue: on some product pages the price is not displayed on screen when the price depends on HikaShop – Price Calculations (price computed from custom fields such as width/height/quantity/shape). What happens The calculation is triggered (an XHR request returns HTTP 200), but the price never renders. The browser console shows: Uncaught TypeError: Cannot read properties of null (reading 'price') Triggered inside the xhr.onreadystatechange callback (hikashop.js). Technical evidence (Network/XHR) In Network → XHR there is a request named calculate returning: Response: No product id And in Payload / Form data, only these parameters are sent: {"cart_type":"cart","add":"1","ctrl":"product","task":"updatecart","return_url":"aHR0cHM6Ly93d3cuaGVybWFub3NnYWxpYW5vLmVzL2NvbXByYXIvZXRpcXVldGFzLXBlcnNvbmFsaXphZGFz"} As you can see, product_id is not being sent. DOM evidence In Elements, I can see: <span id="hikashop_product_id_main" class="hikashop_product_id_main"></span> This span is empty (no ID inside), so the AJAX/calculation flow cannot retrieve the product_id and the request ends with “No product id”. Then the JS tries to read .price and crashes. Important notes This does not affect all products: it happens only on products where the price is calculated using Price Calculations with custom fields. Products with a “normal” price (no calculation) are not affected. Example URL [ www.hermanosgaliano.es/comprar/etiquetas-personalizadas](https://www.hermanosgaliano.es/comprar/etiquetas-personalizadas) Request Could you please confirm if this is a regression in 6.4.0 and provide a patch? It looks like the issue is that product_id is not injected into the DOM (or is not being read properly) when building the calculate/updatecart request. Thank you in advance — this is urgent because it directly impacts conversions. Best regards, José Ángel Hermanos Galiano The following user(s) said Thank You: [oxido](/forum/user/29793-oxido "View oxido's Profile") Please [Log in](/login?return=aHR0cHM6Ly93d3cuaGlrYXNob3AuY29tL2ZvcnVtLzI1LWluc3RhbGwtdXBkYXRlLzkxMDE5MC11cmdlbnQtcHJpY2VzLWFyZS1ub3QtZGlzcGxheWVkLS0taXNzdWUtd2l0aC1wcmljZS1jYWxjdWxhdGlvbnM/dG1wbD1tYXJrZG93bg==) or [Create an account](/component/users/registration?Itemid=101) to join the conversation. - **[nicolas](/forum/user/63-nicolas "View nicolas's Profile")** - [![nicolas's Avatar](https://www.hikashop.com/media/kunena/avatars/resized/size144/users/avatar63.png?1793428657)](/forum/user/63-nicolas "View nicolas's Profile") - [ Away](/forum/user/63-nicolas) Less More - Posts: 86358 - Thank you received: 14293 - - 7 months 3 weeks ago [\#370852](#370852) by [nicolas](/forum/user/63-nicolas "View nicolas's Profile") Replied by *[nicolas](/forum/user/63-nicolas "View nicolas's Profile")* on topic *[URGENT: Prices are not displayed — issue with Price Calculations](/forum/25-install-update/910190-urgent-prices-are-not-displayed---issue-with-price-calculations#370852 "Hi Nicolas, After updating to HikaShop 6.4.0, I’m facing a critical issue: on some product pages the price is not displayed on screen when the price depends on HikaShop – Price Calculations (price computed from custom fields such as width/height/quantity/shape). What happens The calculation is triggered (an XHR request returns HTTP 200), but the price never renders. The browser console shows: Uncaught TypeError: Cannot read properties of null (reading 'price') Triggered inside the xhr.onreadystatechange callback (hikashop.js). Technical evidence (Network/XHR) In Network → XHR there is a request named calculate returning: Response: No product id And in Payload / Form data, only these parameters are sent: {"cart_type":"cart","add":"1","ctrl":"product","task":"updatecart","return_url":"aHR0cHM6Ly93d3cuaGVybWFub3NnYWxpYW5vLmVzL2NvbXByYXIvZXRpcXVldGFzLXBlcnNvbmFsaXphZGFz"} As you can see, product_id is not being sent. DOM evidence In Elements, I can see: This span is empty (no ID inside), so the AJAX/calculation flow cannot retrieve the product_id and the request ends with “No product id”. Then the JS tries to read .price and crashes. Important notes This does not affect all products: it happens only on products where the price is calculated using Price Calculations with custom fields. Products with a “normal” price (no calculation) are not affected. Example URL www.hermanosgaliano.es/comprar/etiquetas-personalizadas Request Could you please confirm if this is a regression in 6.4.0 and provide a patch? It looks like the issue is that product_id is not injected into the DOM (or is not being read properly) when building the calculate/updatecart request. Thank you in advance — this is urgent because it directly impacts conversions. Best regards, José Ángel Hermanos Galiano")* Hi, This is related to the form restructuring on the product page in 6.4.0. The product_id hidden input was moved outside the <form> element and now uses an HTML form attribute to stay associated with the form. The Price Calculations plugin serializes the form data using a method that only collected inputs physically inside the form element, so product_id was missing from the AJAX request. We've fixed this. Please download the updated 6.4.0 package from your member area and reinstall. Make sure to clear your browser cache (Ctrl+Shift+R) to force the JavaScript file to reload. The following user(s) said Thank You: [Reincidente](/forum/user/12307-reincidente "View Reincidente's Profile"), [oxido](/forum/user/29793-oxido "View oxido's Profile") Please [Log in](/login?return=aHR0cHM6Ly93d3cuaGlrYXNob3AuY29tL2ZvcnVtLzI1LWluc3RhbGwtdXBkYXRlLzkxMDE5MC11cmdlbnQtcHJpY2VzLWFyZS1ub3QtZGlzcGxheWVkLS0taXNzdWUtd2l0aC1wcmljZS1jYWxjdWxhdGlvbnM/dG1wbD1tYXJrZG93bg==) or [Create an account](/component/users/registration?Itemid=101) to join the conversation. - **[Reincidente](/forum/user/12307-reincidente "View Reincidente's Profile")** - [![Reincidente's Avatar](https://www.hikashop.com/media/kunena/core/svg/person.svg)](/forum/user/12307-reincidente "View Reincidente's Profile") Topic Author - [ Offline](/forum/user/12307-reincidente) Less More - Posts: 467 - Thank you received: 21 - 7 months 3 weeks ago [\#370854](#370854) by [Reincidente](/forum/user/12307-reincidente "View Reincidente's Profile") Replied by *[Reincidente](/forum/user/12307-reincidente "View Reincidente's Profile")* on topic *[URGENT: Prices are not displayed — issue with Price Calculations](/forum/25-install-update/910190-urgent-prices-are-not-displayed---issue-with-price-calculations#370854 "Hi Nicolas, After updating to HikaShop 6.4.0, I’m facing a critical issue: on some product pages the price is not displayed on screen when the price depends on HikaShop – Price Calculations (price computed from custom fields such as width/height/quantity/shape). What happens The calculation is triggered (an XHR request returns HTTP 200), but the price never renders. The browser console shows: Uncaught TypeError: Cannot read properties of null (reading 'price') Triggered inside the xhr.onreadystatechange callback (hikashop.js). Technical evidence (Network/XHR) In Network → XHR there is a request named calculate returning: Response: No product id And in Payload / Form data, only these parameters are sent: {"cart_type":"cart","add":"1","ctrl":"product","task":"updatecart","return_url":"aHR0cHM6Ly93d3cuaGVybWFub3NnYWxpYW5vLmVzL2NvbXByYXIvZXRpcXVldGFzLXBlcnNvbmFsaXphZGFz"} As you can see, product_id is not being sent. DOM evidence In Elements, I can see: This span is empty (no ID inside), so the AJAX/calculation flow cannot retrieve the product_id and the request ends with “No product id”. Then the JS tries to read .price and crashes. Important notes This does not affect all products: it happens only on products where the price is calculated using Price Calculations with custom fields. Products with a “normal” price (no calculation) are not affected. Example URL www.hermanosgaliano.es/comprar/etiquetas-personalizadas Request Could you please confirm if this is a regression in 6.4.0 and provide a patch? It looks like the issue is that product_id is not injected into the DOM (or is not being read properly) when building the calculate/updatecart request. Thank you in advance — this is urgent because it directly impacts conversions. Best regards, José Ángel Hermanos Galiano")* Thanks Nicolas. It works fine. Best regards. The following user(s) said Thank You: [oxido](/forum/user/29793-oxido "View oxido's Profile") Please [Log in](/login?return=aHR0cHM6Ly93d3cuaGlrYXNob3AuY29tL2ZvcnVtLzI1LWluc3RhbGwtdXBkYXRlLzkxMDE5MC11cmdlbnQtcHJpY2VzLWFyZS1ub3QtZGlzcGxheWVkLS0taXNzdWUtd2l0aC1wcmljZS1jYWxjdWxhdGlvbnM/dG1wbD1tYXJrZG93bg==) or [Create an account](/component/users/registration?Itemid=101) to join the conversation. - **[Reincidente](/forum/user/12307-reincidente "View Reincidente's Profile")** - [![Reincidente's Avatar](https://www.hikashop.com/media/kunena/core/svg/person.svg)](/forum/user/12307-reincidente "View Reincidente's Profile") Topic Author - [ Offline](/forum/user/12307-reincidente) Less More - Posts: 467 - Thank you received: 21 - 7 months 2 weeks ago [\#370888](#370888) by [Reincidente](/forum/user/12307-reincidente "View Reincidente's Profile") Replied by *[Reincidente](/forum/user/12307-reincidente "View Reincidente's Profile")* on topic *[URGENT: Prices are not displayed — issue with Price Calculations](/forum/25-install-update/910190-urgent-prices-are-not-displayed---issue-with-price-calculations#370888 "Hi Nicolas, After updating to HikaShop 6.4.0, I’m facing a critical issue: on some product pages the price is not displayed on screen when the price depends on HikaShop – Price Calculations (price computed from custom fields such as width/height/quantity/shape). What happens The calculation is triggered (an XHR request returns HTTP 200), but the price never renders. The browser console shows: Uncaught TypeError: Cannot read properties of null (reading 'price') Triggered inside the xhr.onreadystatechange callback (hikashop.js). Technical evidence (Network/XHR) In Network → XHR there is a request named calculate returning: Response: No product id And in Payload / Form data, only these parameters are sent: {"cart_type":"cart","add":"1","ctrl":"product","task":"updatecart","return_url":"aHR0cHM6Ly93d3cuaGVybWFub3NnYWxpYW5vLmVzL2NvbXByYXIvZXRpcXVldGFzLXBlcnNvbmFsaXphZGFz"} As you can see, product_id is not being sent. DOM evidence In Elements, I can see: This span is empty (no ID inside), so the AJAX/calculation flow cannot retrieve the product_id and the request ends with “No product id”. Then the JS tries to read .price and crashes. Important notes This does not affect all products: it happens only on products where the price is calculated using Price Calculations with custom fields. Products with a “normal” price (no calculation) are not affected. Example URL www.hermanosgaliano.es/comprar/etiquetas-personalizadas Request Could you please confirm if this is a regression in 6.4.0 and provide a patch? It looks like the issue is that product_id is not injected into the DOM (or is not being read properly) when building the calculate/updatecart request. Thank you in advance — this is urgent because it directly impacts conversions. Best regards, José Ángel Hermanos Galiano")* Hi Nicolas. This had been solved, but in some of the new versions something has changed and now the prices are not shown in the articles that refer to the plugin's calculations Price Calculations Please [Log in](/login?return=aHR0cHM6Ly93d3cuaGlrYXNob3AuY29tL2ZvcnVtLzI1LWluc3RhbGwtdXBkYXRlLzkxMDE5MC11cmdlbnQtcHJpY2VzLWFyZS1ub3QtZGlzcGxheWVkLS0taXNzdWUtd2l0aC1wcmljZS1jYWxjdWxhdGlvbnM/dG1wbD1tYXJrZG93bg==) or [Create an account](/component/users/registration?Itemid=101) to join the conversation. - **[nicolas](/forum/user/63-nicolas "View nicolas's Profile")** - [![nicolas's Avatar](https://www.hikashop.com/media/kunena/avatars/resized/size144/users/avatar63.png?1793428657)](/forum/user/63-nicolas "View nicolas's Profile") - [ Away](/forum/user/63-nicolas) Less More - Posts: 86358 - Thank you received: 14293 - - 7 months 2 weeks ago [\#370890](#370890) by [nicolas](/forum/user/63-nicolas "View nicolas's Profile") Replied by *[nicolas](/forum/user/63-nicolas "View nicolas's Profile")* on topic *[URGENT: Prices are not displayed — issue with Price Calculations](/forum/25-install-update/910190-urgent-prices-are-not-displayed---issue-with-price-calculations#370890 "Hi Nicolas, After updating to HikaShop 6.4.0, I’m facing a critical issue: on some product pages the price is not displayed on screen when the price depends on HikaShop – Price Calculations (price computed from custom fields such as width/height/quantity/shape). What happens The calculation is triggered (an XHR request returns HTTP 200), but the price never renders. The browser console shows: Uncaught TypeError: Cannot read properties of null (reading 'price') Triggered inside the xhr.onreadystatechange callback (hikashop.js). Technical evidence (Network/XHR) In Network → XHR there is a request named calculate returning: Response: No product id And in Payload / Form data, only these parameters are sent: {"cart_type":"cart","add":"1","ctrl":"product","task":"updatecart","return_url":"aHR0cHM6Ly93d3cuaGVybWFub3NnYWxpYW5vLmVzL2NvbXByYXIvZXRpcXVldGFzLXBlcnNvbmFsaXphZGFz"} As you can see, product_id is not being sent. DOM evidence In Elements, I can see: This span is empty (no ID inside), so the AJAX/calculation flow cannot retrieve the product_id and the request ends with “No product id”. Then the JS tries to read .price and crashes. Important notes This does not affect all products: it happens only on products where the price is calculated using Price Calculations with custom fields. Products with a “normal” price (no calculation) are not affected. Example URL www.hermanosgaliano.es/comprar/etiquetas-personalizadas Request Could you please confirm if this is a regression in 6.4.0 and provide a patch? It looks like the issue is that product_id is not injected into the DOM (or is not being read properly) when building the calculate/updatecart request. Thank you in advance — this is urgent because it directly impacts conversions. Best regards, José Ángel Hermanos Galiano")* Hi, Can you provide the URL of a page with the issue ? Please [Log in](/login?return=aHR0cHM6Ly93d3cuaGlrYXNob3AuY29tL2ZvcnVtLzI1LWluc3RhbGwtdXBkYXRlLzkxMDE5MC11cmdlbnQtcHJpY2VzLWFyZS1ub3QtZGlzcGxheWVkLS0taXNzdWUtd2l0aC1wcmljZS1jYWxjdWxhdGlvbnM/dG1wbD1tYXJrZG93bg==) or [Create an account](/component/users/registration?Itemid=101) to join the conversation. - **[Reincidente](/forum/user/12307-reincidente "View Reincidente's Profile")** - [![Reincidente's Avatar](https://www.hikashop.com/media/kunena/core/svg/person.svg)](/forum/user/12307-reincidente "View Reincidente's Profile") Topic Author - [ Offline](/forum/user/12307-reincidente) Less More - Posts: 467 - Thank you received: 21 - 7 months 2 weeks ago [\#370892](#370892) by [Reincidente](/forum/user/12307-reincidente "View Reincidente's Profile") Replied by *[Reincidente](/forum/user/12307-reincidente "View Reincidente's Profile")* on topic *[URGENT: Prices are not displayed — issue with Price Calculations](/forum/25-install-update/910190-urgent-prices-are-not-displayed---issue-with-price-calculations#370892 "Hi Nicolas, After updating to HikaShop 6.4.0, I’m facing a critical issue: on some product pages the price is not displayed on screen when the price depends on HikaShop – Price Calculations (price computed from custom fields such as width/height/quantity/shape). What happens The calculation is triggered (an XHR request returns HTTP 200), but the price never renders. The browser console shows: Uncaught TypeError: Cannot read properties of null (reading 'price') Triggered inside the xhr.onreadystatechange callback (hikashop.js). Technical evidence (Network/XHR) In Network → XHR there is a request named calculate returning: Response: No product id And in Payload / Form data, only these parameters are sent: {"cart_type":"cart","add":"1","ctrl":"product","task":"updatecart","return_url":"aHR0cHM6Ly93d3cuaGVybWFub3NnYWxpYW5vLmVzL2NvbXByYXIvZXRpcXVldGFzLXBlcnNvbmFsaXphZGFz"} As you can see, product_id is not being sent. DOM evidence In Elements, I can see: This span is empty (no ID inside), so the AJAX/calculation flow cannot retrieve the product_id and the request ends with “No product id”. Then the JS tries to read .price and crashes. Important notes This does not affect all products: it happens only on products where the price is calculated using Price Calculations with custom fields. Products with a “normal” price (no calculation) are not affected. Example URL www.hermanosgaliano.es/comprar/etiquetas-personalizadas Request Could you please confirm if this is a regression in 6.4.0 and provide a patch? It looks like the issue is that product_id is not injected into the DOM (or is not being read properly) when building the calculate/updatecart request. Thank you in advance — this is urgent because it directly impacts conversions. Best regards, José Ángel Hermanos Galiano")* [ www.hermanosgaliano.es/comprar/etiquetas-personalizadas](https://www.hermanosgaliano.es/comprar/etiquetas-personalizadas) Please [Log in](/login?return=aHR0cHM6Ly93d3cuaGlrYXNob3AuY29tL2ZvcnVtLzI1LWluc3RhbGwtdXBkYXRlLzkxMDE5MC11cmdlbnQtcHJpY2VzLWFyZS1ub3QtZGlzcGxheWVkLS0taXNzdWUtd2l0aC1wcmljZS1jYWxjdWxhdGlvbnM/dG1wbD1tYXJrZG93bg==) or [Create an account](/component/users/registration?Itemid=101) to join the conversation. - **[nicolas](/forum/user/63-nicolas "View nicolas's Profile")** - [![nicolas's Avatar](https://www.hikashop.com/media/kunena/avatars/resized/size144/users/avatar63.png?1793428657)](/forum/user/63-nicolas "View nicolas's Profile") - [ Away](/forum/user/63-nicolas) Less More - Posts: 86358 - Thank you received: 14293 - - 7 months 2 weeks ago [\#370893](#370893) by [nicolas](/forum/user/63-nicolas "View nicolas's Profile") Replied by *[nicolas](/forum/user/63-nicolas "View nicolas's Profile")* on topic *[URGENT: Prices are not displayed — issue with Price Calculations](/forum/25-install-update/910190-urgent-prices-are-not-displayed---issue-with-price-calculations#370893 "Hi Nicolas, After updating to HikaShop 6.4.0, I’m facing a critical issue: on some product pages the price is not displayed on screen when the price depends on HikaShop – Price Calculations (price computed from custom fields such as width/height/quantity/shape). What happens The calculation is triggered (an XHR request returns HTTP 200), but the price never renders. The browser console shows: Uncaught TypeError: Cannot read properties of null (reading 'price') Triggered inside the xhr.onreadystatechange callback (hikashop.js). Technical evidence (Network/XHR) In Network → XHR there is a request named calculate returning: Response: No product id And in Payload / Form data, only these parameters are sent: {"cart_type":"cart","add":"1","ctrl":"product","task":"updatecart","return_url":"aHR0cHM6Ly93d3cuaGVybWFub3NnYWxpYW5vLmVzL2NvbXByYXIvZXRpcXVldGFzLXBlcnNvbmFsaXphZGFz"} As you can see, product_id is not being sent. DOM evidence In Elements, I can see: This span is empty (no ID inside), so the AJAX/calculation flow cannot retrieve the product_id and the request ends with “No product id”. Then the JS tries to read .price and crashes. Important notes This does not affect all products: it happens only on products where the price is calculated using Price Calculations with custom fields. Products with a “normal” price (no calculation) are not affected. Example URL www.hermanosgaliano.es/comprar/etiquetas-personalizadas Request Could you please confirm if this is a regression in 6.4.0 and provide a patch? It looks like the issue is that product_id is not injected into the DOM (or is not being read properly) when building the calculate/updatecart request. Thank you in advance — this is urgent because it directly impacts conversions. Best regards, José Ángel Hermanos Galiano")* Hi, I'm sorry but I don't see the problem on that page: [ i.imgur.com/T0w0urd.png](https://i.imgur.com/T0w0urd.png) It could be some kind of caching issue. Please try with another browser. If you use a CDN (like Cloudflare) or a server-side cache plugin, purge that cache as well. Please [Log in](/login?return=aHR0cHM6Ly93d3cuaGlrYXNob3AuY29tL2ZvcnVtLzI1LWluc3RhbGwtdXBkYXRlLzkxMDE5MC11cmdlbnQtcHJpY2VzLWFyZS1ub3QtZGlzcGxheWVkLS0taXNzdWUtd2l0aC1wcmljZS1jYWxjdWxhdGlvbnM/dG1wbD1tYXJrZG93bg==) or [Create an account](/component/users/registration?Itemid=101) to join the conversation. - **[Reincidente](/forum/user/12307-reincidente "View Reincidente's Profile")** - [![Reincidente's Avatar](https://www.hikashop.com/media/kunena/core/svg/person.svg)](/forum/user/12307-reincidente "View Reincidente's Profile") Topic Author - [ Offline](/forum/user/12307-reincidente) Less More - Posts: 467 - Thank you received: 21 - 7 months 2 weeks ago [\#370896](#370896) by [Reincidente](/forum/user/12307-reincidente "View Reincidente's Profile") Replied by *[Reincidente](/forum/user/12307-reincidente "View Reincidente's Profile")* on topic *[URGENT: Prices are not displayed — issue with Price Calculations](/forum/25-install-update/910190-urgent-prices-are-not-displayed---issue-with-price-calculations#370896 "Hi Nicolas, After updating to HikaShop 6.4.0, I’m facing a critical issue: on some product pages the price is not displayed on screen when the price depends on HikaShop – Price Calculations (price computed from custom fields such as width/height/quantity/shape). What happens The calculation is triggered (an XHR request returns HTTP 200), but the price never renders. The browser console shows: Uncaught TypeError: Cannot read properties of null (reading 'price') Triggered inside the xhr.onreadystatechange callback (hikashop.js). Technical evidence (Network/XHR) In Network → XHR there is a request named calculate returning: Response: No product id And in Payload / Form data, only these parameters are sent: {"cart_type":"cart","add":"1","ctrl":"product","task":"updatecart","return_url":"aHR0cHM6Ly93d3cuaGVybWFub3NnYWxpYW5vLmVzL2NvbXByYXIvZXRpcXVldGFzLXBlcnNvbmFsaXphZGFz"} As you can see, product_id is not being sent. DOM evidence In Elements, I can see: This span is empty (no ID inside), so the AJAX/calculation flow cannot retrieve the product_id and the request ends with “No product id”. Then the JS tries to read .price and crashes. Important notes This does not affect all products: it happens only on products where the price is calculated using Price Calculations with custom fields. Products with a “normal” price (no calculation) are not affected. Example URL www.hermanosgaliano.es/comprar/etiquetas-personalizadas Request Could you please confirm if this is a regression in 6.4.0 and provide a patch? It looks like the issue is that product_id is not injected into the DOM (or is not being read properly) when building the calculate/updatecart request. Thank you in advance — this is urgent because it directly impacts conversions. Best regards, José Ángel Hermanos Galiano")* Nicolas. It's true and I apologize for that. I was testing on another computer that had not removed the cookies/cache from the url. The only thing left pending is not being able to upload files. 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