FS-6108 --resolve caused by switch_ivr_media while on hold

src/switch_core_media.c

@@ -3669,7 +3669,10 @@ SWITCH_DECLARE(int) switch_core_media_toggle_hold(switch_core_session_t *session
 				}
 			}
 
+			if (a_engine->rtp_session) {
 				switch_rtp_set_flag(a_engine->rtp_session, SWITCH_RTP_FLAG_PAUSE);
+			}
+
 			if (v_engine->rtp_session) {
 				switch_rtp_set_flag(v_engine->rtp_session, SWITCH_RTP_FLAG_PAUSE);
 			}
@@ -3679,7 +3682,7 @@ SWITCH_DECLARE(int) switch_core_media_toggle_hold(switch_core_session_t *session
 			switch_channel_presence(session->channel, "unknown", msg, NULL);
 			changed = 1;
 
-			if (a_engine->max_missed_hold_packets) {
+			if (a_engine->max_missed_hold_packets && a_engine->rtp_session) {
 				switch_rtp_set_max_missed_packets(a_engine->rtp_session, a_engine->max_missed_hold_packets);
 			}
 
@@ -3706,7 +3709,10 @@ SWITCH_DECLARE(int) switch_core_media_toggle_hold(switch_core_session_t *session
 			switch_channel_set_flag(session->channel, CF_PROTO_HOLD);
 			switch_channel_mark_hold(session->channel, SWITCH_TRUE);
 
+			if (a_engine->rtp_session) {
 				switch_rtp_set_flag(a_engine->rtp_session, SWITCH_RTP_FLAG_PAUSE);
+			}
+
 			if (v_engine->rtp_session) {
 				switch_rtp_set_flag(v_engine->rtp_session, SWITCH_RTP_FLAG_PAUSE);
 			}
@@ -3721,7 +3727,7 @@ SWITCH_DECLARE(int) switch_core_media_toggle_hold(switch_core_session_t *session
 
 			switch_yield(250000);
 
-			if (a_engine->max_missed_packets) {
+			if (a_engine->max_missed_packets && a_engine->rtp_session) {
 				switch_rtp_reset_media_timer(a_engine->rtp_session);
 				switch_rtp_set_max_missed_packets(a_engine->rtp_session, a_engine->max_missed_packets);
 			}