MediaWiki version: 1.36.0-wmf.5
Argument 1 passed to WikibaseQuality\ConstraintReport\ConstraintCheck\Cache\CachedArray::__construct() must be of the type array, null given, called in /srv/mediawiki/php-1.36.0-wmf.5/extensions/WikibaseQualityConstraints/src/ConstraintCheck/Helper/SparqlHelper.php on line 783
- This seems to be _very_ rare, only a single event in the last 30 days and the code seems to be from 2017
- the error stems from the json of the request not being correctly decoded. Either it is invalid or too deeply nested.
- probably we should just catch it and log it