FS-3869 --resolve

src/mod/applications/mod_conference/mod_conference.c

@@ -1257,7 +1257,8 @@ static void *SWITCH_THREAD_FUNC conference_video_thread_run(switch_thread_t *thr
 		}
 
 		session = conference->floor_holder->session;
-		switch_core_session_read_lock(session);
+
+		if ((status = switch_core_session_read_lock(session)) == SWITCH_STATUS_SUCCESS) {
 			switch_mutex_unlock(conference->mutex);
 			if (!switch_channel_ready(switch_core_session_get_channel(session))) {
 				status = SWITCH_STATUS_FALSE;
@@ -1266,6 +1267,7 @@ static void *SWITCH_THREAD_FUNC conference_video_thread_run(switch_thread_t *thr
 			}
 			switch_mutex_lock(conference->mutex);
 			switch_core_session_rwunlock(session);
+		}
 
 		if (!SWITCH_READ_ACCEPTABLE(status)) {
 			yield = 100000;