[VBDev]

hum yes small bug, open mgc_chatbox.php.

Find :

  /* Tri des messages selon l'ordre d'affichage (ascendant ou descendant) */
  $nb_chats = $vbulletin->db->num_rows($chat_messages);
  if ($vbulletin->options['mgc_cb_chats_ordre']) { // ascendant
   $cpt = $nb_chats - 1;
   while ($chat = $vbulletin->db->fetch_array($chat_messages)) {
    $tableau_chats[$cpt] = $chat;
    $cpt--;
   }
   ksort($tableau_chats);
  } else { //descendant
   while ($chat = $vbulletin->db->fetch_array($chat_messages)) {
    $tableau_chats[] = $chat;
   }  
  }

Replace it by :

  /* Tri des messages selon l'ordre d'affichage (ascendant ou descendant) */
  $nb_chats = $vbulletin->db->num_rows($chat_messages);
  if($nb_chats) {
   if ($vbulletin->options['mgc_cb_chats_ordre']) { // ascendant
    $cpt = $nb_chats - 1;
    while ($chat = $vbulletin->db->fetch_array($chat_messages)) {
     $tableau_chats[$cpt] = $chat;
     $cpt--;
    }
    ksort($tableau_chats);
   } else { //descendant
    while ($chat = $vbulletin->db->fetch_array($chat_messages)) {
     $tableau_chats[] = $chat;
    }  
   }
  }

Will correct it in the next version