explode(): Argument #2 ($string) must be of type string, null given

[seirerman]

I occasionally get errors and warnings in my log, both at the exact same time:

Uncaught TYPO3 Exception: explode(): Argument #2 ($string) must be of type string, null given | TypeError thrown in file /var/html/t3/vendor/wazum/sluggi/Classes/Backend/Controller/FormSlugAjaxController.php in line 81. Requested URL: https://www.domain.com/typo3/ajax/record/slug/suggest?token=--AnonymizedToken--

PHP Warning: Trying to access array offset on value of type null in /var/html/t3/vendor/wazum/sluggi/Classes/Backend/Controller/FormSlugAjaxController.php line 81

I haven't been able to reproduce the errors, though.

TYPO3 13.4.19, sluggi 13.0.3