FS-4593 please test this and post logs if necessary

src/switch_ivr_bridge.c

@@ -588,7 +588,7 @@ static void *audio_bridge_thread(switch_thread_t *thread, void *obj)
 	switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session_a), SWITCH_LOG_DEBUG, "BRIDGE THREAD DONE [%s]\n", switch_channel_get_name(chan_a));
 	switch_channel_clear_flag(chan_a, CF_BRIDGED);
 
-	if (switch_channel_test_flag(chan_a, CF_LEG_HOLDING) && switch_channel_ready(chan_b)) {
+	if (switch_channel_test_flag(chan_a, CF_LEG_HOLDING) && switch_channel_ready(chan_b) && switch_channel_get_state(chan_b) != CS_PARK) {
 		const char *ext = switch_channel_get_variable(chan_a, "hold_hangup_xfer_exten");
 
 		switch_channel_stop_broadcast(chan_b);