```
Wikibase: $idSerialization must match /^Q[1-9]\d{0,9}\z/i
#0 /srv/mediawiki/php-1.30.0-wmf.9/extensions/Wikidata/vendor/wikibase/data-model/src/Entity/ItemId.php(27): Wikibase\DataModel\Entity\ItemId->assertValidIdFormat(string)
#1 /srv/mediawiki/php-1.30.0-wmf.9/extensions/Wikidata/extensions/Constraints/includes/ConstraintCheck/Helper/ConnectionCheckerHelper.php(110): Wikibase\DataModel\Entity\ItemId->__construct(string)
#2 /srv/mediawiki/php-1.30.0-wmf.9/extensions/Wikidata/extensions/Constraints/includes/ConstraintCheck/Helper/ConnectionCheckerHelper.php(65): WikibaseQuality\ConstraintReport\ConstraintCheck\Helper\ConnectionCheckerHelper->parseItemIdSnakValues(array)
#3 /srv/mediawiki/php-1.30.0-wmf.9/extensions/Wikidata/extensions/Constraints/includes/ConstraintCheck/Checker/InverseChecker.php(109): WikibaseQuality\ConstraintReport\ConstraintCheck\Helper\ConnectionCheckerHelper->findStatement(Wikibase\DataModel\Statement\StatementList, string, array)
#4 /srv/mediawiki/php-1.30.0-wmf.9/extensions/Wikidata/extensions/Constraints/includes/ConstraintCheck/DelegatingConstraintChecker.php(237): WikibaseQuality\ConstraintReport\ConstraintCheck\Checker\InverseChecker->checkConstraint(Wikibase\DataModel\Statement\Statement, WikibaseQuality\ConstraintReport\Constraint, Wikibase\DataModel\Entity\Property)
#5 /srv/mediawiki/php-1.30.0-wmf.9/extensions/Wikidata/extensions/Constraints/includes/ConstraintCheck/DelegatingConstraintChecker.php(216): WikibaseQuality\ConstraintReport\ConstraintCheck\DelegatingConstraintChecker->getCheckResultFor(Wikibase\DataModel\Statement\Statement, WikibaseQuality\ConstraintReport\Constraint, Wikibase\DataModel\Entity\Property)
#6 /srv/mediawiki/php-1.30.0-wmf.9/extensions/Wikidata/extensions/Constraints/includes/ConstraintCheck/DelegatingConstraintChecker.php(181): WikibaseQuality\ConstraintReport\ConstraintCheck\DelegatingConstraintChecker->checkConstraintsForStatementOnEntity(array, Wikibase\DataModel\Entity\Property, Wikibase\DataModel\Statement\Statement)
#7 /srv/mediawiki/php-1.30.0-wmf.9/extensions/Wikidata/extensions/Constraints/includes/ConstraintCheck/DelegatingConstraintChecker.php(147): WikibaseQuality\ConstraintReport\ConstraintCheck\DelegatingConstraintChecker->checkStatement(Wikibase\DataModel\Entity\Property, Wikibase\DataModel\Statement\Statement, NULL)
#8 /srv/mediawiki/php-1.30.0-wmf.9/extensions/Wikidata/extensions/Constraints/includes/ConstraintCheck/DelegatingConstraintChecker.php(104): WikibaseQuality\ConstraintReport\ConstraintCheck\DelegatingConstraintChecker->checkEveryStatement(Wikibase\DataModel\Entity\Property, NULL)
#9 /srv/mediawiki/php-1.30.0-wmf.9/extensions/Wikidata/extensions/Constraints/api/CheckConstraints.php(191): WikibaseQuality\ConstraintReport\ConstraintCheck\DelegatingConstraintChecker->checkAgainstConstraintsOnEntityId(Wikibase\DataModel\Entity\PropertyId, NULL)
#10 /srv/mediawiki/php-1.30.0-wmf.9/extensions/Wikidata/extensions/Constraints/api/CheckConstraints.php(179): WikibaseQuality\ConstraintReport\Api\CheckConstraints->checkItems(array, NULL)
#11 /srv/mediawiki/php-1.30.0-wmf.9/includes/api/ApiMain.php(1583): WikibaseQuality\ConstraintReport\Api\CheckConstraints->execute()
#12 /srv/mediawiki/php-1.30.0-wmf.9/includes/api/ApiMain.php(546): ApiMain->executeAction()
#13 /srv/mediawiki/php-1.30.0-wmf.9/includes/api/ApiMain.php(517): ApiMain->executeActionWithErrorHandling()
#14 /srv/mediawiki/php-1.30.0-wmf.9/api.php(94): ApiMain->execute()
#15 /srv/mediawiki/w/api.php(3): include(string)
#16 {main}
```
Started around the same time, similar to {T170597}