diff --git a/ext/ogg/gstoggstream.c b/ext/ogg/gstoggstream.c
index d477397654..b4ee557737 100644
--- a/ext/ogg/gstoggstream.c
+++ b/ext/ogg/gstoggstream.c
@@ -2240,6 +2240,23 @@ extract_tags_daala (GstOggStream * pad, ogg_packet * packet)
 /* *INDENT-OFF* */
 /* indent hates our freedoms */
 const GstOggMap mappers[] = {
+  {
+    /* Empty mapper for uninitialized pads/streams */
+    NULL, 0, G_MAXINT32,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL
+  },
   {
     "\200theora", 7, 42,
     "video/x-theora",