Error when trying to Export

-- url of the page with the problem -- : craigmarksdiamonds.co.za/
-- HikaShop version -- : HikaShop Essential 4.0.2 [1901251806]
-- Joomla version -- : Joomla! 3.9.8
-- PHP version -- : 7.3.19-1+0~20200612.60+debian9~1.gbp6c8fe1
-- Browser(s) name and version -- : Chrome
-- Error-message(debug-mod must be tuned on) -- : Recoverable fatal error: Object of class stdClass could not be converted to string in /usr/www/users/craigmbpfa/administrator/components/com_hikashop/helpers/spreadsheet.php on line 179

I am not a professional but have a limited ability on Joomla. I am getting this error when trying to export my Hikashop Products:
Recoverable fatal error: Object of class stdClass could not be converted to string in /usr/www/users/craigmbpfa/administrator/components/com_hikashop/helpers/spreadsheet.php on line 179

How can i fix this so i am able to export my products?

where do i find the file to rename? i dont want to update as it requires me to pay for the update and i am no longer going to be using Hikashop