diff --git a/htdocs/core/class/html.formother.class.php b/htdocs/core/class/html.formother.class.php
index a35a73546bb..b3d41d80ffb 100644
--- a/htdocs/core/class/html.formother.class.php
+++ b/htdocs/core/class/html.formother.class.php
@@ -395,7 +395,7 @@ class FormOther
         if ($showempty) $out.='<option value="0">&nbsp;</option>';
 
         // Get list of users allowed to be viewed
-        $sql_usr = "SELECT u.rowid, u.lastname, u.firstname, u.statut, u.login";
+        $sql_usr = "SELECT DISTINCT u.rowid, u.lastname, u.firstname, u.statut, u.login";
         $sql_usr.= " FROM ".MAIN_DB_PREFIX."user as u";
 
         if (! empty($conf->global->MULTICOMPANY_TRANSVERSE_MODE))
@@ -428,9 +428,7 @@ class FormOther
             	if (! empty($user->admin) && empty($user->entity) && $conf->entity == 1) {
             		$sql_usr.= " WHERE u2.entity IS NOT NULL"; // Show all users
             	} else {
-            		$sql_usr.= ",".MAIN_DB_PREFIX."usergroup_user as ug2";
-            		$sql_usr.= " WHERE ug2.fk_user = u2.rowid";
-            		$sql_usr.= " AND ug2.entity IN (".getEntity('user').")";
+            		$sql_usr.= " WHERE EXISTS (SELECT ug2.fk_user FROM ".MAIN_DB_PREFIX."usergroup_user as ug2 WHERE u2.rowid = ug2.fk_user AND ug2.entity IN (".getEntity('user').") )";
             	}
             }
             else