diff --git a/ImageViewer/ViewController.swift b/ImageViewer/ViewController.swift
index 2bb2d64..41f5322 100644
--- a/ImageViewer/ViewController.swift
+++ b/ImageViewer/ViewController.swift
@@ -1381,7 +1381,10 @@ extension ViewController: UICollectionViewDataSource, UICollectionViewDelegateFl
     {
         if collectionView == comicCollectionView {
             return comics.count
-        } else {
+        } else if collectionView == scrollingCollectionView {
+            if metadata == nil {
+                return 0
+            }
             var sum = 0
             for volume in metadata.volumes {
                 for chapter in volume.chapters {
@@ -1390,6 +1393,7 @@ extension ViewController: UICollectionViewDataSource, UICollectionViewDelegateFl
             }
             return sum
         }
+        return 0
     }
 
     func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath)