When I use Special:GlobalUserRights, when I entered a user, I get these messages:
Warning: array_merge() [function.array-merge]: Argument #1 is not an array in /var/www/techwiki/metawiki/includes/specials/SpecialUserrights.php on line 334
Warning: array_intersect() [function.array-intersect]: Argument #1 is not an array in /var/www/techwiki/metawiki/includes/specials/SpecialUserrights.php on line 335
Warning: array_merge() [function.array-merge]: Argument #1 is not an array in /var/www/techwiki/metawiki/includes/specials/SpecialUserrights.php on line 337
Warning: array_diff() [function.array-diff]: Argument #1 is not an array in /var/www/techwiki/metawiki/includes/specials/SpecialUserrights.php on line 338
When I try to change the user's global groups I get this as well as what's above:

Warning: array_merge() [function.array-merge]: Argument #2 is not an array in /var/www/techwiki/metawiki/includes/specials/SpecialUserrights.php on line 148
Warning: array_merge() [function.array-merge]: Argument #2 is not an array in /var/www/techwiki/metawiki/includes/specials/SpecialUserrights.php on line 149
Warning: array_intersect() [function.array-intersect]: Argument #2 is not an array in /var/www/techwiki/metawiki/includes/specials/SpecialUserrights.php on line 152
Warning: array_unique() [function.array-unique]: The argument should be an array in /var/www/techwiki/metawiki/includes/specials/SpecialUserrights.php on line 152
Warning: array_intersect() [function.array-intersect]: Argument #2 is not an array in /var/www/techwiki/metawiki/includes/specials/SpecialUserrights.php on line 154
Warning: array_unique() [function.array-unique]: The argument should be an array in /var/www/techwiki/metawiki/includes/specials/SpecialUserrights.php on line 154

And the user's global groups don't change. It even happens in the latest trunk revision (r42512)

Version: unspecified
Severity: normal