PHP 8.1 - Deprecated function: stripos(): Passing null to parameter #1 ($haystack) of type string is deprecated

Seeing this warning on a site after running the PHP8.1 update. Confirming that the patch fixes it.

+! RTBC. Ran into this same error with v5.x of the module after upgrading to PHP 8.1. Patch applied to 5.x and fixed the error.

Patch in #2 doesn't apply with 6.0.x branch.
Updating the patch.
Keeping in RTBC only.