diff --git a/app/fastwhisper.py b/app/fastwhisper.py
index f5739e3..36061f7 100644
--- a/app/fastwhisper.py
+++ b/app/fastwhisper.py
@@ -25,7 +25,10 @@ async def asr(request, *args, **kw):
 	env = request._run_ns
 	ret = await env.fastwhisper.submit_task(env.params_kw)
 	data = await env.fastwhisper.get_status(ret['task_id'])
-	data['result'] = json.loads(data['result'])
+	if data['status'] == 'SUCCEEDED':
+		s = data.get('result')
+		if s:
+			data['result'] = json.loads(s)
 	return data
 
 async def start_fw_server(*args, **kw):