Internal error

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[a3dc0df74e43c2431e4c13b9] /index.php?title=Electronics_project_notes/Device_voltage_and_impedance,_audio_and_otherwise&curid=6169&diff=84657&oldid=84629 MediaWiki\Revision\RevisionAccessException: Failed to load data blob from Expected array in serialized string for revision 84629. 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/diff/DifferenceEngine.php(388): MediaWiki\Revision\SlotRecord->getContent()
#4 /data/db_ssd/var-www/wiki-helpful/includes/diff/DifferenceEngine.php(361): DifferenceEngine->loadSingleSlot()
#5 /data/db_ssd/var-www/wiki-helpful/includes/diff/DifferenceEngine.php(308): DifferenceEngine->getSlotContents()
#6 /data/db_ssd/var-www/wiki-helpful/includes/diff/DifferenceEngine.php(1183): DifferenceEngine->getSlotDiffRenderers()
#7 /data/db_ssd/var-www/wiki-helpful/includes/diff/DifferenceEngine.php(892): DifferenceEngine->showDiffStyle()
#8 /data/db_ssd/var-www/wiki-helpful/includes/page/Article.php(952): DifferenceEngine->showDiffPage()
#9 /data/db_ssd/var-www/wiki-helpful/includes/page/Article.php(486): Article->showDiffPage()
#10 /data/db_ssd/var-www/wiki-helpful/includes/actions/ViewAction.php(78): Article->view()
#11 /data/db_ssd/var-www/wiki-helpful/includes/MediaWiki.php(556): ViewAction->show()
#12 /data/db_ssd/var-www/wiki-helpful/includes/MediaWiki.php(333): MediaWiki->performAction()
#13 /data/db_ssd/var-www/wiki-helpful/includes/MediaWiki.php(923): MediaWiki->performRequest()
#14 /data/db_ssd/var-www/wiki-helpful/includes/MediaWiki.php(576): MediaWiki->main()
#15 /data/db_ssd/var-www/wiki-helpful/index.php(50): MediaWiki->run()
#16 /data/db_ssd/var-www/wiki-helpful/index.php(46): wfIndexMain()
#17 {main}