We get the following internal error when trying to restore a deleted article:
[XKJHAgpAIDAAAEflR2MAAABC] 2019-04-01 17:14:42: Fataler Ausnahmefehler des Typs „MediaWiki\Revision\IncompleteRevisionException“
We tried to restore this article: Böotien
2019-04-01 17:14:42 [XKJHAgpAIDAAAEflR2MAAABC] mw1327 dewikivoyage 1.33.0-wmf.23 exception ERROR: [XKJHAgpAIDAAAEflR2MAAABC] /w/index.php?title=Spezial:Wiederherstellen&action=submit MediaWiki\Revision\IncompleteRevisionException from line 427 of /srv/mediawiki/php-1.33.0-wmf.23/includes/Revision/RevisionStore.php: sha1 field must not be ''! {"exception_id":"XKJHAgpAIDAAAEflR2MAAABC","exception_url":"/w/index.php?title=Spezial:Wiederherstellen&action=submit","caught_by":"mwe_handler"} [Exception MediaWiki\Revision\IncompleteRevisionException] (/srv/mediawiki/php-1.33.0-wmf.23/includes/Revision/RevisionStore.php:427) sha1 field must not be ''! #0 /srv/mediawiki/php-1.33.0-wmf.23/includes/Revision/RevisionStore.php(478): MediaWiki\Revision\RevisionStore->failOnEmpty(string, string) #1 /srv/mediawiki/php-1.33.0-wmf.23/includes/page/PageArchive.php(776): MediaWiki\Revision\RevisionStore->insertRevisionOn(MediaWiki\Revision\RevisionArchiveRecord, Wikimedia\Rdbms\DatabaseMysqli) #2 /srv/mediawiki/php-1.33.0-wmf.23/includes/page/PageArchive.php(506): PageArchive->undeleteRevisions(array, boolean, string) #3 /srv/mediawiki/php-1.33.0-wmf.23/includes/specials/SpecialUndelete.php(1175): PageArchive->undelete(array, string, array, boolean, User) #4 /srv/mediawiki/php-1.33.0-wmf.23/includes/specials/SpecialUndelete.php(204): SpecialUndelete->undelete() #5 /srv/mediawiki/php-1.33.0-wmf.23/includes/specialpage/SpecialPage.php(569): SpecialUndelete->execute(NULL) #6 /srv/mediawiki/php-1.33.0-wmf.23/includes/specialpage/SpecialPageFactory.php(558): SpecialPage->run(NULL) #7 /srv/mediawiki/php-1.33.0-wmf.23/includes/MediaWiki.php(288): MediaWiki\Special\SpecialPageFactory->executePath(Title, RequestContext) #8 /srv/mediawiki/php-1.33.0-wmf.23/includes/MediaWiki.php(867): MediaWiki->performRequest() #9 /srv/mediawiki/php-1.33.0-wmf.23/includes/MediaWiki.php(517): MediaWiki->main() #10 /srv/mediawiki/php-1.33.0-wmf.23/index.php(42): MediaWiki->run() #11 /srv/mediawiki/w/index.php(3): include(string) #12 {main}