fix: do not pass null to strpos

[darthf1]

Fixes:

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

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (main@092e893). Click here to learn what that means.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #384   +/-   ##
=======================================
  Coverage        ?   99.58%           
  Complexity      ?      361           
=======================================
  Files           ?       20           
  Lines           ?      968           
  Branches        ?        0           
=======================================
  Hits            ?      964           
  Misses          ?        4           
  Partials        ?        0           

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[ankitpokhrel]

Thank you @darthf1 🎉