* Fix bug #18664.

module/execution/control.php

@@ -1982,6 +1982,7 @@ class execution extends control
         $avatarPairs = $this->user->getAvatarPairs();
         foreach($avatarPairs as $account => $avatar)
         {
+            if(!isset($users[$account])) continue;
             $userList[$account]['realname'] = $users[$account];
             $userList[$account]['avatar']   = $avatar;
         }

module/tutorial/model.php

@@ -293,6 +293,7 @@ class tutorialModel extends model
         $execution->totalLeft      = 0;
         $execution->totalHours     = 0;
         $execution->totalEstimate  = 0;
+        $execution->displayCards   = 0;
         return $execution;
     }