From 2a73f863ffc3b2da65355f1132485ed18ff3ae07 Mon Sep 17 00:00:00 2001
From: Tim Hunt <T.J.Hunt@open.ac.uk>
Date: Tue, 16 Aug 2011 11:36:54 +0100
Subject: [PATCH] MDL-28687 questions avoid fatal errors when reviewing
 attempts at deleted questions.

---
 lib/questionlib.php | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/questionlib.php b/lib/questionlib.php
index fe52dfefff7..446fa95783b 100644
--- a/lib/questionlib.php
+++ b/lib/questionlib.php
@@ -1343,6 +1343,11 @@ function question_has_capability_on($question, $cap, $cachecat = -1) {
         }
         $question = $questions[$question];
     }
+    if (empty($question->category)) {
+        // This can happen when we have created a fake 'missingtype' question to
+        // take the place of a deleted question.
+        return false;
+    }
     if (!isset($categories[$question->category])) {
         if (!$categories[$question->category] = $DB->get_record('question_categories',
                 array('id'=>$question->category))) {
-- 
2.17.1