=== Error ===
Request ID: `AWkwmGhB1DNFq-AX-mxu`
```name=message
Postcondition failed: Namespace for entity type property must be defined!
```
```name=trace,lines=10
#0 /srv/mediawiki/php-1.33.0-wmf.19/extensions/Wikibase/repo/includes/Content/EntityHandler.php(449): Wikimedia\Assert\Assert::postcondition(boolean, string)
#1 /srv/mediawiki/php-1.33.0-wmf.19/extensions/Wikibase/repo/includes/Content/EntityHandler.php(433): Wikibase\Repo\Content\EntityHandler->getEntityNamespace()
#2 /srv/mediawiki/php-1.33.0-wmf.19/extensions/Wikibase/repo/includes/Content/EntityContentFactory.php(145): Wikibase\Repo\Content\EntityHandler->getTitleForId(Wikibase\DataModel\Entity\PropertyId)
#3 /srv/mediawiki/php-1.33.0-wmf.19/extensions/Wikibase/repo/includes/Store/TypeDispatchingEntityTitleStoreLookup.php(44): Wikibase\Repo\Content\EntityContentFactory->getTitleForId(Wikibase\DataModel\Entity\PropertyId)
#4 /srv/mediawiki/php-1.33.0-wmf.19/extensions/Wikibase/lib/includes/Formatters/LabelsProviderEntityIdHtmlLinkFormatter.php(58): Wikibase\Repo\Store\TypeDispatchingEntityTitleStoreLookup->getTitleForId(Wikibase\DataModel\Entity\PropertyId)
#5 /srv/mediawiki/php-1.33.0-wmf.19/extensions/Wikibase/lib/includes/Formatters/EntityIdValueFormatter.php(44): Wikibase\Lib\LabelsProviderEntityIdHtmlLinkFormatter->formatEntityId(Wikibase\DataModel\Entity\PropertyId)
#6 /srv/mediawiki/php-1.33.0-wmf.19/extensions/Wikibase/lib/includes/Formatters/DispatchingValueFormatter.php(75): Wikibase\Lib\EntityIdValueFormatter->format(Wikibase\DataModel\Entity\EntityIdValue)
#7 /srv/mediawiki/php-1.33.0-wmf.19/extensions/Wikibase/repo/includes/Api/FormatSnakValue.php(104): Wikibase\Lib\Formatters\DispatchingValueFormatter->formatValue(Wikibase\DataModel\Entity\EntityIdValue, NULL)
#8 /srv/mediawiki/php-1.33.0-wmf.19/includes/api/ApiMain.php(1596): Wikibase\Repo\Api\FormatSnakValue->execute()
#9 /srv/mediawiki/php-1.33.0-wmf.19/includes/api/ApiMain.php(531): ApiMain->executeAction()
#10 /srv/mediawiki/php-1.33.0-wmf.19/includes/api/ApiMain.php(502): ApiMain->executeActionWithErrorHandling()
#11 /srv/mediawiki/php-1.33.0-wmf.19/api.php(87): ApiMain->execute()
#12 /srv/mediawiki/w/api.php(3): include(string)
#13 {main}
```
=== Impact ===
no idea?
=== Notes ===
An example URL:
https://commons.wikimedia.org/w/api.php?action=wbformatvalue&format=json&datavalue=%7B%22type%22%3A%22wikibase-entityid%22%2C%22value%22%3A%7B%22id%22%3A%22P1%22%7D%7D&options=%7B%22lang%22%3A%22en%22%7D&generate=text%2Fhtml
All exceptions went from `commonswiki`