From a40eaaa28f50ab5413fb665272b8461d56894d83 Mon Sep 17 00:00:00 2001
From: Tim Hunt <T.J.Hunt@open.ac.uk>
Date: Mon, 13 Oct 2014 17:32:22 +0100
Subject: [PATCH] MDL-47651 quiz responses: allow for qtypes without responses

---
 mod/quiz/report/responses/first_or_all_responses_table.php | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/mod/quiz/report/responses/first_or_all_responses_table.php b/mod/quiz/report/responses/first_or_all_responses_table.php
index 1d91655e12f..4a90a08e40e 100644
--- a/mod/quiz/report/responses/first_or_all_responses_table.php
+++ b/mod/quiz/report/responses/first_or_all_responses_table.php
@@ -132,6 +132,10 @@ class quiz_first_or_all_responses_table extends quiz_last_responses_table {
      */
     public function get_summary_after_try($tablerow, $slot) {
         $qa = $this->get_question_attempt($tablerow->usageid, $slot);
+        if (!($qa->get_question() instanceof question_manually_gradable)) {
+            // No responses, and we cannot call summarise_response below.
+            return null;
+        }
         $submissionsteps = $qa->get_steps_with_submitted_response_iterator();
         $step = $submissionsteps[$tablerow->try];
         if ($step === null) {