UserMerge cannot create an actor for a usable name that is not an existing user.
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	Silkwood
	Jan 3 2020, 3:36 PM

Description

MediaWiki 1.33.1 (d35fba2) 15:11, December 17, 2019
PHP 7.2.17-0ubuntu0.18.04.1 (apache2handler)
MariaDB 10.1.38-MariaDB-0ubuntu0.18.04.1

After upgrading to 1.33 and without experiencing any problems before, UserMerge now returns this internal error if I try to delete a user.

[c02b64cc6985efa1bd1d9998] /wiki/Special:UserMerge CannotCreateActorException from line 2516 of /var/www/w/includes/user/User.php: Cannot create an actor for a usable name that is not an existing user

Backtrace:

#0 /var/www/w/extensions/UserMerge/includes/MergeUser.php(378): User->getActorId(Wikimedia\Rdbms\DatabaseMysqli)
#1 /var/www/w/extensions/UserMerge/includes/MergeUser.php(50): MergeUser->mergeDatabaseTables(string)
#2 /var/www/w/extensions/UserMerge/includes/SpecialUserMerge.php(135): MergeUser->merge(User, string)
#3 /var/www/w/includes/htmlform/HTMLForm.php(660): SpecialUserMerge->onSubmit(array, OOUIHTMLForm)
#4 /var/www/w/includes/htmlform/HTMLForm.php(552): HTMLForm->trySubmit()
#5 /var/www/w/includes/htmlform/HTMLForm.php(567): HTMLForm->tryAuthorizedSubmit()
#6 /var/www/w/includes/specialpage/FormSpecialPage.php(184): HTMLForm->show()
#7 /var/www/w/includes/specialpage/SpecialPage.php(569): FormSpecialPage->execute(NULL)
#8 /var/www/w/includes/specialpage/SpecialPageFactory.php(558): SpecialPage->run(NULL)
#9 /var/www/w/includes/MediaWiki.php(288): MediaWiki\Special\SpecialPageFactory->executePath(Title, RequestContext)
#10 /var/www/w/includes/MediaWiki.php(865): MediaWiki->performRequest()
#11 /var/www/w/includes/MediaWiki.php(515): MediaWiki->main()
#12 /var/www/w/index.php(42): MediaWiki->run()
#13 {main}

NOTE: I have never had to explicitly declare user B (Anonymous) before.

Related Objects

Mentioned In: T238632: "Cannot create an actor for a usable name that is not an existing user" when deleting a user (merge to "Anonymous")
Mentioned Here: rMWd35fba235167: Update RELEASE-NOTES

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Silkwood created this task.Jan 3 2020, 3:36 PM

Restricted Application added a subscriber: Aklapper. · View Herald TranscriptJan 3 2020, 3:36 PM

@Silkwood: Assuming this task is about MediaWiki-extensions-UserMerge hence adding project tag so others can find this task when searching for tasks under that project or looking at that project workboard.

Solved!
It was enough to add the following line in LocalSettings.php

// Add just one user name to the default array
$wgReservedUsernames[] = 'Anonymous';

Great to hear that you found a solution. Reopening this task as the code should still not show a raw exception in that case but gracefully handle this.

Florian closed this task as a duplicate of T238632: "Cannot create an actor for a usable name that is not an existing user" when deleting a user (merge to "Anonymous").Apr 13 2020, 10:49 AM

Florian mentioned this in T238632: "Cannot create an actor for a usable name that is not an existing user" when deleting a user (merge to "Anonymous").Apr 13 2020, 10:59 AM

UserMerge cannot create an actor for a usable name that is not an existing user.Closed, DuplicatePublicActions

Description

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UserMerge cannot create an actor for a usable name that is not an existing user.
Closed, DuplicatePublic
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