diff --git a/htdocs/core/lib/usergroups.lib.php b/htdocs/core/lib/usergroups.lib.php
index bf9c98dc903..d6097b6f5a1 100644
--- a/htdocs/core/lib/usergroups.lib.php
+++ b/htdocs/core/lib/usergroups.lib.php
@@ -179,9 +179,9 @@ function user_admin_prepare_head()
 	// Entries must be declared in modules descriptor with line
 	// $this->tabs = array('entity:+tabname:Title:@mymodule:/mymodule/mypage.php?id=__ID__');   to add new tab
 	// $this->tabs = array('entity:-tabname);   												to remove a tab
-	complete_head_from_modules($conf,$langs,$object,$head,$h,'useradmin');
+	complete_head_from_modules($conf,$langs,null,$head,$h,'useradmin');
 
-	complete_head_from_modules($conf,$langs,$object,$head,$h,'useradmin','remove');
+	complete_head_from_modules($conf,$langs,null,$head,$h,'useradmin','remove');
 
 	return $head;
 }