Dear support team,
i created a new user account and after login i got this kind of error log:
Original exception: [Yo9ML669KSz_XHwmMx9EPwAABGA] /index.php?title=Hauptseite TypeError: Return value of MediaWiki\Permissions\GroupPermissionsLookup::getGroupPermissions() must be of the type array, null returned
Backtrace:
from /mnt/web412/c0/90/5210590/htdocs/wiki/includes/Permissions/GroupPermissionsLookup.php(103)
#0 /mnt/web412/c0/90/5210590/htdocs/wiki/includes/Permissions/PermissionManager.php(1523): MediaWiki\Permissions\GroupPermissionsLookup->getGroupPermissions()
#1 /mnt/web412/c0/90/5210590/htdocs/wiki/includes/Permissions/PermissionManager.php(1423): MediaWiki\Permissions\PermissionManager->getGroupPermissions()
#2 /mnt/web412/c0/90/5210590/htdocs/wiki/includes/Permissions/PermissionManager.php(1372): MediaWiki\Permissions\PermissionManager->getUserPermissions()
#3 /mnt/web412/c0/90/5210590/htdocs/wiki/includes/Permissions/PermissionManager.php(584): MediaWiki\Permissions\PermissionManager->userHasRight()
#4 /mnt/web412/c0/90/5210590/htdocs/wiki/includes/Permissions/PermissionManager.php(464): MediaWiki\Permissions\PermissionManager->checkReadPermissions()
#5 /mnt/web412/c0/90/5210590/htdocs/wiki/includes/Permissions/PermissionManager.php(311): MediaWiki\Permissions\PermissionManager->getPermissionErrorsInternal()
#6 /mnt/web412/c0/90/5210590/htdocs/wiki/includes/Permissions/UserAuthority.php(259): MediaWiki\Permissions\PermissionManager->getPermissionErrors()
#7 /mnt/web412/c0/90/5210590/htdocs/wiki/includes/Permissions/UserAuthority.php(205): MediaWiki\Permissions\UserAuthority->internalCan()
#8 /mnt/web412/c0/90/5210590/htdocs/wiki/includes/user/User.php(4319): MediaWiki\Permissions\UserAuthority->authorizeRead()
#9 /mnt/web412/c0/90/5210590/htdocs/wiki/includes/MediaWiki.php(225): User->authorizeRead()
#10 /mnt/web412/c0/90/5210590/htdocs/wiki/includes/MediaWiki.php(930): MediaWiki->performRequest()
#11 /mnt/web412/c0/90/5210590/htdocs/wiki/includes/MediaWiki.php(564): MediaWiki->main()
#12 /mnt/web412/c0/90/5210590/htdocs/wiki/index.php(53): MediaWiki->run()
#13 /mnt/web412/c0/90/5210590/htdocs/wiki/index.php(46): wfIndexMain()
#14 {main}
Any ideas?