Product Export fails after upgrade

-- url of the page with the problem -- : www.brisbanepoolrobotics.com.au
-- HikaShop version -- : 4.5.0
-- Joomla version -- : 3.10.8
-- PHP version -- : 7.4.28
-- Browser(s) name and version -- : Firefox
-- Error-message(debug-mod must be tuned on) -- : An error has occurred.

0 syntax error, unexpected 'if' (T_IF), expecting function (T_FUNCTION) or const (T_CONST)

I've just updated to Hikashop 4.5.0 from 4.4.0 and the product export now fails with the error syntax error, unexpected 'if' (T_IF), expecting function (T_FUNCTION) or const (T_CONS as soon as I click on the export menu item. I have tried with all products selected, 1 product selected and zero products selcted with the same result each time.

I downgraded to 4.4.0 and was able to export. Upgraded again to 4.5.0 and no exports again.