From 9d8a35f807f7efbf07b05cb1c6a33c3bdbe7ea24 Mon Sep 17 00:00:00 2001
From: Frode Petterson <frode.andre.petterson@gmail.com>
Date: Mon, 2 May 2016 11:05:59 +0200
Subject: [PATCH] Added extra check to upgrade script

---
 upgrades.js | 24 +++++++++++++-----------
 1 file changed, 13 insertions(+), 11 deletions(-)

diff --git a/upgrades.js b/upgrades.js
index a44e08f..dc41328 100644
--- a/upgrades.js
+++ b/upgrades.js
@@ -28,18 +28,20 @@ H5PUpgrades['H5P.QuestionSet'] = (function ($) {
        */
       8: function (parameters, finished) {
 
-        if (parameters.override.overrideButtons) {
-          // Set new variables
-          parameters.override.showSolutionButton =
-              (parameters.override.overrideShowSolutionButton ? 'on' : 'off');
-          parameters.override.retryButton =
-              (parameters.override.overrideRetry ? 'on' : 'off');
-        }
+        if (parameters.override) {
+          if (parameters.override.overrideButtons) {
+            // Set new variables
+            parameters.override.showSolutionButton =
+                (parameters.override.overrideShowSolutionButton ? 'on' : 'off');
+            parameters.override.retryButton =
+                (parameters.override.overrideRetry ? 'on' : 'off');
+          }
 
-        // Remove old field variables
-        delete parameters.override.overrideButtons;
-        delete parameters.override.overrideShowSolutionButton;
-        delete parameters.override.overrideRetry;
+          // Remove old field variables
+          delete parameters.override.overrideButtons;
+          delete parameters.override.overrideShowSolutionButton;
+          delete parameters.override.overrideRetry;
+        }
 
         // Move copyright dialog question label
         if (parameters.questionLabel) {