When I try to change the content model for any page title, I get the following stackktrace:
[XskOBKwQBHcAAC4x1qAAAAAF] /wiki/Special:ChangeContentModel?pagetitle=Example TypeError from line 47 of /srv/mediawiki/php-master/includes/editpage/SpamChecker.php: Argument 1 passed to MediaWiki\EditPage\SpamChecker::checkSummary() must be of the type string, null given, called in /srv/mediawiki/php-master/includes/EditPage.php on line 2692 Backtrace: #0 /srv/mediawiki/php-master/includes/EditPage.php(2692): MediaWiki\EditPage\SpamChecker->checkSummary(NULL) #1 /srv/mediawiki/php-master/includes/specials/SpecialChangeContentModel.php(150): EditPage::matchSummarySpamRegex(NULL) #2 /srv/mediawiki/php-master/includes/htmlform/HTMLFormField.php(315): SpecialChangeContentModel->{closure}(NULL, array, OOUIHTMLForm) #3 /srv/mediawiki/php-master/includes/htmlform/HTMLFormField.php(897): HTMLFormField->validate(NULL, array) #4 /srv/mediawiki/php-master/includes/htmlform/HTMLFormField.php(606): HTMLFormField->getErrorsRaw(NULL) #5 /srv/mediawiki/php-master/includes/htmlform/HTMLForm.php(1693): HTMLFormField->getOOUI(NULL) #6 /srv/mediawiki/php-master/includes/htmlform/HTMLForm.php(1289): HTMLForm->displaySection(array, string) #7 /srv/mediawiki/php-master/includes/htmlform/OOUIHTMLForm.php(282): HTMLForm->getBody() #8 /srv/mediawiki/php-master/includes/htmlform/HTMLForm.php(1073): OOUIHTMLForm->getBody() #9 /srv/mediawiki/php-master/includes/htmlform/HTMLForm.php(1052): HTMLForm->getHTML(boolean) #10 /srv/mediawiki/php-master/includes/htmlform/HTMLForm.php(606): HTMLForm->displayForm(boolean) #11 /srv/mediawiki/php-master/includes/specialpage/FormSpecialPage.php(187): HTMLForm->show() #12 /srv/mediawiki/php-master/includes/specialpage/SpecialPage.php(582): FormSpecialPage->execute(NULL) #13 /srv/mediawiki/php-master/includes/specialpage/SpecialPageFactory.php(623): SpecialPage->run(NULL) #14 /srv/mediawiki/php-master/includes/MediaWiki.php(299): MediaWiki\SpecialPage\SpecialPageFactory->executePath(Title, RequestContext) #15 /srv/mediawiki/php-master/includes/MediaWiki.php(978): MediaWiki->performRequest() #16 /srv/mediawiki/php-master/includes/MediaWiki.php(535): MediaWiki->main() #17 /srv/mediawiki/php-master/index.php(47): MediaWiki->run() #18 /srv/mediawiki/w/index.php(3): require(string) #19 {main}