Internal error

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[75e753f6fde69264d41ae404] /index.php?title=Python_notes_-_threads/threading&oldid=42349 MediaWiki\Revision\RevisionAccessException: Failed to load data blob from Expected array in serialized string for revision 42349. If this problem persist, use the findBadBlobs maintenance script to investigate the issue and mark bad blobs.

Backtrace:

from /data/db_ssd/var-www/wiki-helpful/includes/Revision/RevisionStore.php(1193)
#0 /data/db_ssd/var-www/wiki-helpful/includes/Revision/RevisionStore.php(1507): MediaWiki\Revision\RevisionStore->loadSlotContent()
#1 [internal function]: MediaWiki\Revision\RevisionStore->MediaWiki\Revision\{closure}()
#2 /data/db_ssd/var-www/wiki-helpful/includes/Revision/SlotRecord.php(324): call_user_func()
#3 /data/db_ssd/var-www/wiki-helpful/includes/Revision/RevisionRecord.php(183): MediaWiki\Revision\SlotRecord->getContent()
#4 /data/db_ssd/var-www/wiki-helpful/includes/Revision/RenderedRevision.php(229): MediaWiki\Revision\RevisionRecord->getContentOrThrow()
#5 /data/db_ssd/var-www/wiki-helpful/includes/Revision/RevisionRenderer.php(227): MediaWiki\Revision\RenderedRevision->getSlotParserOutput()
#6 /data/db_ssd/var-www/wiki-helpful/includes/Revision/RevisionRenderer.php(164): MediaWiki\Revision\RevisionRenderer->combineSlotOutput()
#7 [internal function]: MediaWiki\Revision\RevisionRenderer->MediaWiki\Revision\{closure}()
#8 /data/db_ssd/var-www/wiki-helpful/includes/Revision/RenderedRevision.php(199): call_user_func()
#9 /data/db_ssd/var-www/wiki-helpful/includes/poolcounter/PoolWorkArticleView.php(87): MediaWiki\Revision\RenderedRevision->getRevisionParserOutput()
#10 /data/db_ssd/var-www/wiki-helpful/includes/poolcounter/PoolWorkArticleViewOld.php(65): PoolWorkArticleView->renderRevision()
#11 /data/db_ssd/var-www/wiki-helpful/includes/poolcounter/PoolCounterWork.php(166): PoolWorkArticleViewOld->doWork()
#12 /data/db_ssd/var-www/wiki-helpful/includes/page/ParserOutputAccess.php(299): PoolCounterWork->execute()
#13 /data/db_ssd/var-www/wiki-helpful/includes/page/Article.php(735): MediaWiki\Page\ParserOutputAccess->getParserOutput()
#14 /data/db_ssd/var-www/wiki-helpful/includes/page/Article.php(545): Article->generateContentOutput()
#15 /data/db_ssd/var-www/wiki-helpful/includes/actions/ViewAction.php(78): Article->view()
#16 /data/db_ssd/var-www/wiki-helpful/includes/MediaWiki.php(556): ViewAction->show()
#17 /data/db_ssd/var-www/wiki-helpful/includes/MediaWiki.php(333): MediaWiki->performAction()
#18 /data/db_ssd/var-www/wiki-helpful/includes/MediaWiki.php(923): MediaWiki->performRequest()
#19 /data/db_ssd/var-www/wiki-helpful/includes/MediaWiki.php(576): MediaWiki->main()
#20 /data/db_ssd/var-www/wiki-helpful/index.php(50): MediaWiki->run()
#21 /data/db_ssd/var-www/wiki-helpful/index.php(46): wfIndexMain()
#22 {main}