TypeError: Symfony\Component\HttpFoundation\ParameterBag::has(): Argument #1 ($key) must be of type string, null given

Problem/Motivation

Warning: Undefined array key "blacklisted_paths" in /var/www/html/web/modules/contrib/language_cookie/src/Plugin/LanguageCookieCondition/LanguageCookieConditionBlacklistedPaths.php on line 101
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TypeError: Symfony\Component\HttpFoundation\ParameterBag::has(): Argument #1 ($key) must be of type string, null given, called in /var/www/html/web/modules/contrib/language_cookie/src/Plugin/LanguageNegotiation/LanguageNegotiationCookie.php on line 80 in Symfony\Component\HttpFoundation\ParameterBag->has() (line 97 of /var/www/html/vendor/symfony/http-foundation/ParameterBag.php).

Proposed resolution

Add null verification