diff --git a/src/store/index.js b/src/store/index.js
index b8b5ffe16..359d9cb3b 100644
--- a/src/store/index.js
+++ b/src/store/index.js
@@ -997,7 +997,7 @@ export const actions = {
   savePartQuestionAnswers(context, partQuestionAnswersArray) {
     // if part question answers have changed, reset subsequent question answers
     const previousResultsArray = context.getters.damage.partQuestionAnswers;
-    const havePartQuestionAnswersChanged = previousResultsArray.length !== partQuestionAnswersArray.length ||
+    const havePartQuestionAnswersChanged = previousResultsArray?.length !== partQuestionAnswersArray.length ||
       !previousResultsArray.every((x, i) => x.result === partQuestionAnswersArray[i].result);
 
     if (havePartQuestionAnswersChanged) {