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All found issues originate from the maxwarningpoints setting being equal to zero and emit a PHP warning Division by zero.

https://github.com/mybb/mybb/blob/featur....php#L1056
https://github.com/mybb/mybb/blob/featur....php#L3570

https://github.com/mybb/mybb/blob/featur...s.php#L373
https://github.com/mybb/mybb/blob/featur...s.php#L374
https://github.com/mybb/mybb/blob/featur...s.php#L561
https://github.com/mybb/mybb/blob/featur...s.php#L562

https://github.com/mybb/mybb/blob/featur...t.php#L377

https://github.com/mybb/mybb/blob/featur....php#L2430

https://github.com/mybb/mybb/blob/featur....php#L3694

https://github.com/mybb/mybb/blob/featur...s.php#L344
https://github.com/mybb/mybb/blob/featur...s.php#L411
https://github.com/mybb/mybb/blob/featur...s.php#L741

repsperpage setting-related:
https://github.com/mybb/mybb/blob/featur...n.php#L835
https://github.com/mybb/mybb/blob/featur...n.php#L854 (zero as an argument)

membersperpage setting-related:
https://github.com/mybb/mybb/blob/featur...p.php#L355 (zero as an argument)

I think that's all.

I can't understand how these things weren't thought of in the first place. If an integer can be zero and is being used anywhere near division, it should be sanity-checked.

I guess this comes from a decade-old codebase.

yup, related to this . Should all be fixed in one go.

Hi,

Thank you for your report. We have pushed this issue to our Github repository for further analysis where you can track our commits and progress with fixing this bug. Discussions regarding this bug may also take place there too.

Follow this link to visit the issue on Github: https://github.com/mybb/mybb/issues/1956

Thanks for contributing to MyBB!

Regards,
The MyBB Group