Bug rebuild search index

[Robert9]

Code:

ErrorException: [E_DEPRECATED] preg_replace(): Passing null to parameter #3 ($subject) of type array|string is deprecated in src/XF/Search/Source/MySqlFt.php at line 425

    XF::handlePhpError()
    preg_replace() in src/XF/Search/Source/MySqlFt.php at line 425
    XF\Search\Source\MySqlFt->getMetadataKey() in src/XF/Search/Source/MySqlFt.php at line 36
    XF\Search\Source\MySqlFt->index() in src/XF/Search/Search.php at line 42
    XF\Search\Search->index() in src/XF/Search/Search.php at line 61...

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