Error "201 Must be a valid URL" by check out

-- HikaShop version -- : 4.0.1
-- Joomla version -- : 3.9.1
-- PHP version -- : 7.3.0
-- Browser(s) name and version -- : n/a
-- Error-message(debug-mod must be tuned on) -- : 201 URL mus be a valid URL

Since last week my webshop at the checkout gives the error message "201 URL must be a valid URL".
It used iDeal.
I do not know why this problem occurs.
Who can help me further?

Hi,

There is no such error message in HikaShop.
Is that error only when you pay with iDeal ? If you try with another payment method like PayPal (you can test it with a fake email address), do you get the same error ? If not, then the problem is likely with iDeal and I'll recommend you to check with the developer of that payment plugin.
Otherwise, we'll need more information in order to reproduce the problem.

Thank you Nicolas,
I have discovered that Hikashop has trouble with PHP 7.3 and that after I started using version 7.2 the error message did not occur anymore. This has solved my problem.
Jan

Hi,

Thank you for your feedback. We'll look into it. We didn't yet work on the compatibility of HikaShop with PHP 7.3 as it's just been out for a few weeks.