diff --git a/src/importers/ankipro.py b/src/importers/ankipro.py
index 3de37ca..ad6daf4 100644
--- a/src/importers/ankipro.py
+++ b/src/importers/ankipro.py
@@ -202,7 +202,9 @@ def _import_cards(self) -> int:
                         media_ids = media_side_map.get(side, [])
                         if media_ids:
                             contents += "<br>".join(
-                                media_refs_map[id] for id in media_ids
+                                media_refs_map[id]
+                                for id in media_ids
+                                if id in media_refs_map
                             )
                         contents += note_dict["fields"][side]
                         note.fields[i] = contents