NumberEntryPart.cleanAnswer(undefined) returns ''

numbas · Nov 25, 2020 · 0ae2375 · 0ae2375
1 parent d06ba5f
commit 0ae2375
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/runtime/scripts/parts/numberentry.js b/runtime/scripts/parts/numberentry.js
@@ -224,6 +224,9 @@ NumberEntryPart.prototype = /** @lends Numbas.parts.NumberEntryPart.prototype */
      * @returns {string}
      */
     cleanAnswer: function(answer) {
+        if(answer===undefined) {
+            answer = '';
+        }
         answer = answer.toString().trim();
         return answer;
     },