diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index 162cfb62dacd7377301fc8117c01adb2366c47db..3627132931656e24a3ab51a0a20e35fa5ff99976 100644
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -5996,7 +5996,7 @@ static int add_sdp(struct sip_request *resp, struct sip_pvt *p)
 	if (option_debug > 2)
 		ast_log(LOG_DEBUG, "-- Done with adding codecs to SDP\n");
 
-	if(!ast_internal_timing_enabled(p->owner))
+	if(!p->owner || !ast_internal_timing_enabled(p->owner))
 		ast_build_string(&a_audio_next, &a_audio_left, "a=silenceSupp:off - - - -\r\n");
 
 	if ((m_audio_left < 2) || (m_video_left < 2) || (a_audio_left == 0) || (a_video_left == 0))