diff --git a/blocks/messages/block_messages.php b/blocks/messages/block_messages.php
index 6d6ba200482..5293c1d69d5 100644
--- a/blocks/messages/block_messages.php
+++ b/blocks/messages/block_messages.php
@@ -30,7 +30,7 @@ class block_messages extends block_base {
                                             {$CFG->prefix}message m 
                                        WHERE m.useridto = '$USER->id' 
                                          AND u.id = m.useridfrom
-                                    GROUP BY m.useridfrom");
+                                    GROUP BY m.useridfrom, u.firstname,u.lastname,u.picture,u.lastaccess");
 
 
         //Now, we have in users, the list of users to show