diff --git a/js/stores/windowStore.js b/js/stores/windowStore.js
index de80cba9325..752e2a2a5e9 100644
--- a/js/stores/windowStore.js
+++ b/js/stores/windowStore.js
@@ -118,11 +118,9 @@ const newFrame = (state, frameOpts) => {
     console.debug('newFrame', frameOpts)
   }
   // Ensure valid index
-  let insertionIndex = frameOpts.index != null
-    ? frameOpts.index
-    : 0
+  let insertionIndex = frameOpts.index
   const highestFrameIndex = (state.get('frames') || Immutable.List()).count()
-  if (insertionIndex === -1 || insertionIndex > highestFrameIndex) {
+  if (insertionIndex == null || insertionIndex === -1 || insertionIndex > highestFrameIndex) {
     if (shouldLogDebug) {
       console.debug(`newFrame: invalid insertionIndex of ${insertionIndex} so using max index of ${highestFrameIndex}`)
     }