diff --git a/src/sidebar/components/ShareDialog/ExportAnnotations.tsx b/src/sidebar/components/ShareDialog/ExportAnnotations.tsx
index 58af4b4be62..681d239b86c 100644
--- a/src/sidebar/components/ShareDialog/ExportAnnotations.tsx
+++ b/src/sidebar/components/ShareDialog/ExportAnnotations.tsx
@@ -60,7 +60,7 @@ function ExportAnnotations({
   const defaultFilename = useMemo(
     () =>
       suggestedFilename({
-        documentMetadata: contentFrame.metadata,
+        documentMetadata: contentFrame?.metadata,
         groupName: group?.name,
       }),
     [contentFrame, group],
diff --git a/src/sidebar/store/modules/frames.ts b/src/sidebar/store/modules/frames.ts
index f2678947364..b5c613a9fdf 100644
--- a/src/sidebar/store/modules/frames.ts
+++ b/src/sidebar/store/modules/frames.ts
@@ -163,7 +163,16 @@ const mainFrame = createSelector(
  */
 const defaultContentFrame = createSelector(
   (state: State) => state.frames,
-  frames => firstFrameWithoutId(frames) ?? frames[0] ?? null,
+  frames => {
+    const mainFrame = firstFrameWithoutId(frames);
+    if (mainFrame) {
+      return mainFrame;
+    } else if (frames.length > 0) {
+      return frames[0];
+    } else {
+      return null;
+    }
+  },
 );
 
 function searchUrisForFrame(frame: Frame): string[] {