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I keep encountering the following error in the error log after adding an answer, comment, or making a modification: "PHP Deprecated: mb_strtolower(): Passing null to parameter #1 ($string) of type string is deprecated in /home1/xxxxxx/public_html/xxxxxx/qa-include/util/string.php on line 765."

What should I do? Please help me.
Q2A version: 1.8.6

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