Just tried to make a minor edit, and got a similar result.
[ZeyfdR0iUpVuRNgrNmZYwgAMARE] /wiki/index.php?title=Manual&action=submit CannotCreateActorException: Failed to create actor ID for user_id=16302 user_name="Johnicboom"
Backtrace:
from /srv/www/vhosts/pyra-handheld.com/httpdocs/wiki/includes/user/ActorStore.php(431)
#0 /srv/www/vhosts/pyra-handheld.com/httpdocs/wiki/includes/user/ActorMigrationBase.php(370): MediaWiki\User\ActorStore->acquireActorId(User, Wikimedia\Rdbms\DatabaseMysqli)
#1 /srv/www/vhosts/pyra-handheld.com/httpdocs/wiki/includes/user/ActorMigration.php(143): MediaWiki\User\ActorMigrationBase->getInsertValuesWithTempTable(Wikimedia\Rdbms\DatabaseMysqli, string, User)
#2 /srv/www/vhosts/pyra-handheld.com/httpdocs/wiki/includes/Revision/RevisionStore.php(775): MediaWiki\User\ActorMigration->getInsertValuesWithTempTable(Wikimedia\Rdbms\DatabaseMysqli, string, User)
#3 /srv/www/vhosts/pyra-handheld.com/httpdocs/wiki/includes/Revision/RevisionStore.php(632): MediaWiki\Revision\RevisionStore->insertRevisionRowOn(Wikimedia\Rdbms\DatabaseMysqli, MediaWiki\Revision\MutableRevisionRecord, integer)
#4 /srv/www/vhosts/pyra-handheld.com/httpdocs/wiki/includes/Revision/RevisionStore.php(483): MediaWiki\Revision\RevisionStore->insertRevisionInternal(MediaWiki\Revision\MutableRevisionRecord, Wikimedia\Rdbms\DatabaseMysqli, User, MediaWiki\CommentStore\CommentStoreComment, MediaWiki\Title\Title, integer, integer)
#5 /srv/www/vhosts/pyra-handheld.com/httpdocs/wiki/includes/libs/rdbms/database/Database.php(2611): MediaWiki\Revision\RevisionStore->MediaWiki\Revision\{closure}(Wikimedia\Rdbms\DatabaseMysqli, string)
#6 /srv/www/vhosts/pyra-handheld.com/httpdocs/wiki/includes/libs/rdbms/database/DBConnRef.php(119): Wikimedia\Rdbms\Database->doAtomicSection(string, Closure)
#7 /srv/www/vhosts/pyra-handheld.com/httpdocs/wiki/includes/libs/rdbms/database/DBConnRef.php(680): Wikimedia\Rdbms\DBConnRef->__call(string, array)
#8 /srv/www/vhosts/pyra-handheld.com/httpdocs/wiki/includes/Revision/RevisionStore.php(474): Wikimedia\Rdbms\DBConnRef->doAtomicSection(string, Closure)
#9 /srv/www/vhosts/pyra-handheld.com/httpdocs/wiki/includes/Storage/PageUpdater.php(1391): MediaWiki\Revision\RevisionStore->insertRevisionOn(MediaWiki\Revision\MutableRevisionRecord, Wikimedia\Rdbms\DBConnRef)
#10 /srv/www/vhosts/pyra-handheld.com/httpdocs/wiki/includes/Storage/PageUpdater.php(937): MediaWiki\Storage\PageUpdater->doModify(MediaWiki\CommentStore\CommentStoreComment)
#11 /srv/www/vhosts/pyra-handheld.com/httpdocs/wiki/includes/editpage/EditPage.php(2650): MediaWiki\Storage\PageUpdater->saveRevision(MediaWiki\CommentStore\CommentStoreComment, integer)
#12 /srv/www/vhosts/pyra-handheld.com/httpdocs/wiki/includes/editpage/EditPage.php(1961): MediaWiki\EditPage\EditPage->internalAttemptSave(array, boolean, boolean)
#13 /srv/www/vhosts/pyra-handheld.com/httpdocs/wiki/includes/editpage/EditPage.php(772): MediaWiki\EditPage\EditPage->attemptSave(array)
#14 /srv/www/vhosts/pyra-handheld.com/httpdocs/wiki/includes/actions/EditAction.php(74): MediaWiki\EditPage\EditPage->edit()
#15 /srv/www/vhosts/pyra-handheld.com/httpdocs/wiki/includes/actions/SubmitAction.php(38): EditAction->show()
#16 /srv/www/vhosts/pyra-handheld.com/httpdocs/wiki/includes/MediaWiki.php(556): SubmitAction->show()
#17 /srv/www/vhosts/pyra-handheld.com/httpdocs/wiki/includes/MediaWiki.php(333): MediaWiki->performAction(Article, MediaWiki\Title\Title)
#18 /srv/www/vhosts/pyra-handheld.com/httpdocs/wiki/includes/MediaWiki.php(923): MediaWiki->performRequest()
#19 /srv/www/vhosts/pyra-handheld.com/httpdocs/wiki/includes/MediaWiki.php(576): MediaWiki->main()
#20 /srv/www/vhosts/pyra-handheld.com/httpdocs/wiki/index.php(50): MediaWiki->run()
#21 /srv/www/vhosts/pyra-handheld.com/httpdocs/wiki/index.php(46): wfIndexMain()
#22 {main}