Note: It looks like a possible SQL injection attempt.
Error
MediaWiki version: 1.37.0-wmf.6
message
Argument 1 passed to WikiPage::factory() must implement interface MediaWiki\Page\PageIdentity, null given, called in /srv/mediawiki/php-1.37.0-wmf.6/extensions/LiquidThreads/api/ApiFeedLQTThreads.php on line 187