Using PHP 8.1 we can got an error:
Deprecated function: rawurlencode(): Passing null to parameter #1 ($string) of type string is deprecated in FacetApiPrettyPathsCoderDefault->encodePathSegment() (line 24 of [modules_path]/facetapi_pretty_paths/plugins/coders/facetapi_pretty_paths_coder_default.inc).
Add an additional check for the value.
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