I managed to find some logs relating to my problem, not zen cart logs.

Code:
[17-May-2021 22:29:00 UTC] PHP Recoverable fatal error:  Object of class queryFactoryResult could not be converted to string in /home/thegluep/devstore.thegluepeople.co.uk/***ADMIN***/sqlpatch.php on line 753
[18-May-2021 08:46:38 UTC] PHP Recoverable fatal error:  Object of class queryFactoryResult could not be converted to string in /home/thegluep/devstore.thegluepeople.co.uk/***ADMIN***/sqlpatch.php on line 785