diff --git a/structures.c b/structures.c
index 994f759..9bb6def 100644
--- a/tgl/structures.c
+++ b/tgl/structures.c
@@ -941,7 +941,8 @@ void tglf_fetch_message_media_new (struct tgl_state *TLS, struct tgl_message_med
     M->venue.venue_id = DS_STR_DUP (DS_MM->venue_id);   
     break;
   default:
-    assert (0);
+    M->type = tgl_message_media_unsupported;
+    break;
   }
 }