diff --git a/src/record/mutation.ts b/src/record/mutation.ts
index fd4ac71060..ac24ebea5a 100644
--- a/src/record/mutation.ts
+++ b/src/record/mutation.ts
@@ -361,7 +361,7 @@ export default class MutationBuffer {
       }
       if (!node) {
         for (let index = addList.length - 1; index >= 0; index--) {
-          const _node = addList.get(index)!;
+          const _node = addList.get(index);
           // ensure _node is defined before attempting to find value
           if (_node) {
             const parentId = this.mirror.getId(