diff --git a/application/core/MY_Model.php b/application/core/MY_Model.php
index fc5f506..741769f 100644
--- a/application/core/MY_Model.php
+++ b/application/core/MY_Model.php
@@ -13,9 +13,11 @@
 
 
 class MY_Model extends CI_Model{
-	
+
 			function __construct(){
 					parent::__construct();
+					// Disable ONLY_FULL_GROUP_BY for legacy queries
+					$this->db->query("SET sql_mode=(SELECT REPLACE(@@sql_mode,'ONLY_FULL_GROUP_BY',''))");
 		}
 	
 	function get_record_by_id($id, $fieldname=FALSE, $row=TRUE){
diff --git a/application/models/monpas/Groepen_model.php b/application/models/monpas/Groepen_model.php
index a0481ef..d9f5823 100644
--- a/application/models/monpas/Groepen_model.php
+++ b/application/models/monpas/Groepen_model.php
@@ -117,7 +117,7 @@ class Groepen_model extends MY_Model{
                       AND     GR.schooljaarnr   = {$schooljaarnr}
                       AND     GR.schooltype     = 'R'
                       AND     GR.module         = {$module}
-                    GROUP BY  GR.id
+                    GROUP BY  GR.id, GR.naam, GR.niveau, GR.totaantal, GR.ondersteuning
                     ORDER BY  niveau, naam, GR.id ";
         return $this->get_query_result();
     }
@@ -146,7 +146,7 @@ class Groepen_model extends MY_Model{
                       AND     GR.schooljaarnr   = {$schooljaarnr}
                       AND     GR.schooltype     = 'R'
                       AND     GR.module         = {$module}
-                    GROUP BY  GR.id
+                    GROUP BY  GR.id, GR.naam, GR.niveau, GR.totaantal
                     ORDER BY  niveau, naam, GR.id ";
         return $this->get_query_result();
     }