We recently migrated and then upgraded a MediaWiki, and the upgrade was a major upgrade.

It run successfully, but then tome pages, such as the home page, showed errors like this:

MediaWiki\Revision\RevisionAccessException from line 1676 of /home/mysite/www/www/includes/Revision/RevisionStore.php: Main slot of revision 38921 not found in database!

We found several reports of this error online and the Mediawiki RevisionAccessException forum page on https://www.mediawiki.org/ suggests a solution. We tried that and found that using

$wgMultiContentRevisionSchemaMigrationStage = SCHEMA_COMPAT_WRITE_BOTH | SCHEMA_COMPAT_READ_OLD;

in LocalSettings.php fixed the problem.


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