Today's JSON dump failed:
```
Exception encountered, of type "Wikibase\DataModel\Services\Lookup\EntityLookupException"
[54d6a459] [no req] Wikibase\DataModel\Services\Lookup\EntityLookupException from line 49 of /srv/mediawiki/php-1.27.0-wmf.7/extensions/Wikidata/extensions/Wikibase/lib/includes/store/RevisionBasedEntityLookup.php: Entity lookup failed for: Q21196443
Backtrace:
#0 /srv/mediawiki/php-1.27.0-wmf.7/extensions/Wikidata/extensions/Wikibase/repo/includes/Dumpers/JsonDumpGenerator.php(133): Wikibase\Lib\Store\RevisionBasedEntityLookup->getEntity(Wikibase\DataModel\Entity\ItemId)
#1 /srv/mediawiki/php-1.27.0-wmf.7/extensions/Wikidata/extensions/Wikibase/repo/includes/Dumpers/DumpGenerator.php(302): Wikibase\Dumpers\JsonDumpGenerator->generateDumpForEntityId(Wikibase\DataModel\Entity\ItemId)
#2 /srv/mediawiki/php-1.27.0-wmf.7/extensions/Wikidata/extensions/Wikibase/repo/includes/Dumpers/DumpGenerator.php(273): Wikibase\Dumpers\DumpGenerator->dumpEntities(array, integer)
#3 /srv/mediawiki/php-1.27.0-wmf.7/extensions/Wikidata/extensions/Wikibase/repo/maintenance/dumpEntities.php(178): Wikibase\Dumpers\DumpGenerator->generateDump(Wikibase\Repo\Store\SQL\EntityPerPageIdPager)
#4 /srv/mediawiki/php-1.27.0-wmf.7/extensions/Wikidata/extensions/Wikibase/repo/maintenance/dumpJson.php(76): Wikibase\DumpScript->execute()
#5 /srv/mediawiki/php-1.27.0-wmf.7/maintenance/doMaintenance.php(103): Wikibase\DumpJson->execute()
#6 /srv/mediawiki/php-1.27.0-wmf.7/extensions/Wikidata/extensions/Wikibase/repo/maintenance/dumpJson.php(107): include(string)
#7 /srv/mediawiki/multiversion/MWScript.php(97): include(string)
#8 {main}
```
After fixing this, I will re-create the dump.