fix FSCORE-225

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@10426 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/switch_ivr_async.c

@@ -1577,6 +1577,10 @@ static void *SWITCH_THREAD_FUNC speech_thread(switch_thread_t *thread, void *obj
 		char *xmlstr = NULL;
 
 		switch_thread_cond_wait(sth->cond, sth->mutex);
+
+		if(switch_test_flag(sth->ah, SWITCH_ASR_FLAG_CLOSED))
+			break;
+
 		if (switch_core_asr_check_results(sth->ah, &flags) == SWITCH_STATUS_SUCCESS) {
 			switch_event_t *event;