strpos(): Passing null to parameter #1 ($haystack) of type string is deprecated

Created a patch for the issue mentioned, please review.
Thank you.

Thank you for reporting the issue.

The issue summary is there to help move the ticket along, for the reviewers, and committers. Can we please add back.

#6 tags for steps to reproduce which is 100% needed. This could be a symptom of a bigger issue.

Will need a test case showing the issue.