Have you maybe configured that user ID as a forced SuperAdmin?

Check for forcedsuperadmin in config-default.php and config.php

Fix committed to master branch: http://bugs.limesurvey.org/plugin.php?page=Source/view&id=38791

I have added a fix so that in the next version a proper error should be shown.

Fix committed to master branch: http://bugs.limesurvey.org/plugin.php?page=Source/view&id=38792

@c_schmitz: Thank you for your hint and the fix for more informatoin.

But all I have in config-default.php is line

674:$config['forcedsuperadmin'] = array(1);

The user I try to delete is ID 2.
Maybe an array key shift?
0 => 1 ?
1 => 2 ?

Sorry - no, the suggestion with the shift key makes no sense when you look at it:

grep -R forcedsuperadmin
config/config-defaults.php:$config['forcedsuperadmin'] = array(1);
helpers/update/updatedb_helper.php: $forcedSuperadmin = Yii::app()->getConfig('forcedsuperadmin');
models/SettingGlobal.php: 'forcedsuperadmin', // This is for security
models/User.php: / OR are inside forcedsuperadmin config */
models/User.php: $criteria->addInCondition('t.uid', App()->getConfig('forcedsuperadmin'), 'OR');
models/Permission.php: return in_array($iUserID, App()->getConfig('forcedsuperadmin'));

Can you try to manually apply the fix (the small one) and check if you get a different error?

�This fixed my issue, thank you @C_schmitz.

I was given the option of transferring the existing surveys for the user to another user.

Thank you!

image.png (6,607 bytes)   

image.png (6,607 bytes)   

@c_schmitz, we noticed that when using the mass action delete function, the "error" notice at the user's screenshot gets shown for users owning surveys. In this case the dleete option fails.
Other users which are not owning any surveys can be deleted.
For survey owners deletion works if you use the "Delete" option from the "Action" menu on the right.

Does your fix already cover the case of survey owners?

Yep, it should. Please verify.

Fixed in Release 6.13.1+250428