diff --git a/sys/v4l2/gstv4l2videodec.c b/sys/v4l2/gstv4l2videodec.c
index a00ccd9..838ebff 100644
--- a/sys/v4l2/gstv4l2videodec.c
+++ b/sys/v4l2/gstv4l2videodec.c
@@ -260,10 +260,12 @@
      * block. */
     {
       GstCaps *caps = gst_pad_get_current_caps (decoder->srcpad);
-      GstQuery *query = gst_query_new_allocation (caps, FALSE);
-      gst_pad_peer_query (decoder->srcpad, query);
-      gst_query_unref (query);
-      gst_caps_unref (caps);
+      if (caps) {
+        GstQuery *query = gst_query_new_allocation (caps, FALSE);
+        gst_pad_peer_query (decoder->srcpad, query);
+        gst_query_unref (query);
+        gst_caps_unref (caps);
+      }
     }
 
     gst_v4l2_object_stop (self->v4l2capture);