diff --git a/src/music_kraken/download/page_attributes.py b/src/music_kraken/download/page_attributes.py
index 60e85f7..58a15d5 100644
--- a/src/music_kraken/download/page_attributes.py
+++ b/src/music_kraken/download/page_attributes.py
@@ -75,6 +75,9 @@ class Pages:
             return music_object
         
         for source_page in music_object.source_collection.source_pages:
+            if source_page not in self._source_to_page:
+                continue
+
             page_type = self._source_to_page[source_page]
             
             if page_type in self._pages_set: