Bad value for parameter $s: must be a string

#0 /srv/mediawiki/php-1.33.0-wmf.22/languages/Language.php(2845): Wikimedia\Assert\Assert::parameterType(string, boolean, string)
#1 /srv/mediawiki/php-1.33.0-wmf.22/includes/WebRequest.php(394): Language->checkTitleEncoding(boolean)
#2 /srv/mediawiki/php-1.33.0-wmf.22/includes/WebRequest.php(441): WebRequest->getGPCVal(array, string, NULL)
#3 /srv/mediawiki/php-1.33.0-wmf.22/includes/api/ApiMain.php(1774): WebRequest->getVal(string)
#4 /srv/mediawiki/php-1.33.0-wmf.22/includes/api/ApiMain.php(1793): ApiMain->getVal(string, NULL)
#5 /srv/mediawiki/php-1.33.0-wmf.22/includes/api/ApiBase.php(1167): ApiMain->getCheck(string)
#6 /srv/mediawiki/php-1.33.0-wmf.22/includes/api/ApiBase.php(771): ApiBase->getParameterFromSettings(string, array, boolean)
#7 /srv/mediawiki/php-1.33.0-wmf.22/includes/api/ApiQuery.php(246): ApiBase->extractRequestParams()
#8 /srv/mediawiki/php-1.33.0-wmf.22/includes/api/ApiMain.php(1595): ApiQuery->execute()
#9 /srv/mediawiki/php-1.33.0-wmf.22/includes/api/ApiMain.php(500): ApiMain->executeAction()
#10 /srv/mediawiki/php-1.33.0-wmf.22/extensions/TextExtracts/includes/Hooks.php(34): ApiMain->execute()
#11 /srv/mediawiki/php-1.33.0-wmf.22/includes/Hooks.php(174): TextExtracts\Hooks::onApiOpenSearchSuggest(array)
#12 /srv/mediawiki/php-1.33.0-wmf.22/includes/Hooks.php(202): Hooks::callHook(string, array, array, NULL)
#13 /srv/mediawiki/php-1.33.0-wmf.22/includes/api/ApiOpenSearch.php(94): Hooks::run(string, array)
#14 /srv/mediawiki/php-1.33.0-wmf.22/includes/api/ApiMain.php(1595): ApiOpenSearch->execute()
#15 /srv/mediawiki/php-1.33.0-wmf.22/includes/api/ApiMain.php(531): ApiMain->executeAction()
#16 /srv/mediawiki/php-1.33.0-wmf.22/includes/api/ApiMain.php(502): ApiMain->executeActionWithErrorHandling()
#17 /srv/mediawiki/php-1.33.0-wmf.22/api.php(87): ApiMain->execute()
#18 /srv/mediawiki/w/api.php(3): include(string)
#19 {main}