diff --git a/lib/questionlib.php b/lib/questionlib.php
index 0ea1b4c0c0e..f641d8191b6 100644
--- a/lib/questionlib.php
+++ b/lib/questionlib.php
@@ -1073,6 +1073,7 @@ function question_process_responses(&$question, &$state, $action, $cmoptions, &$
 
     // If $action->event is not set that implies saving
     if (! isset($action->event)) {
+        debugging('Ambiguous action in question_process_responses.' , DEBUG_DEVELOPER);
         $action->event = QUESTION_EVENTSAVE;
     }
     // If submitted then compare against last graded
diff --git a/mod/quiz/attempt.php b/mod/quiz/attempt.php
index f38e46dfa25..26c22e9f3e0 100644
--- a/mod/quiz/attempt.php
+++ b/mod/quiz/attempt.php
@@ -371,6 +371,7 @@
         foreach($questionidarray as $i) {
             if (!isset($actions[$i])) {
                 $actions[$i]->responses = array('' => '');
+                $actions[$i]->event = QUESTION_EVENTSAVE;
             }
             $actions[$i]->timestamp = $timestamp;
             question_process_responses($questions[$i], $states[$i], $actions[$i], $quiz, $attempt);