List that has been used for over a year with no problems but now....

[cheyennemtnman]

This error is popping up
"0 array_key_exists(): Argument #2 ($array) must be of type array, null given" How can I determine where the problem might lie?

 

[cheyennemtnman]

The only thing done to site was updated PHP to 8.0

 

[lousyfool]

The only thing done to site was updated PHP to 8.0

Then you should do a Github update, that should fix it.

 

[ontarget]

If you have some calc elements then the code used in those could be causing the issue. I would recommend starting there and using var_dump to check what is happening. I fixed a load of errors this way after updating to php8