diff --git a/gst/mpegtsdemux/mpegtspacketizer.c b/gst/mpegtsdemux/mpegtspacketizer.c
index 4543243ca0..23f223b602 100644
--- a/gst/mpegtsdemux/mpegtspacketizer.c
+++ b/gst/mpegtsdemux/mpegtspacketizer.c
@@ -2624,6 +2624,7 @@ mpegts_packetizer_next_packet (MpegTSPacketizer2 * packetizer,
       priv->mapped =
           (guint8 *) gst_adapter_map (packetizer->adapter, priv->mapped_size);
       priv->offset = 0;
+      g_return_val_if_fail (priv->mapped, PACKET_NEED_MORE);
     }
     packet->data_start = priv->mapped + priv->offset;