fix undefine bug

play.js

@@ -510,7 +510,7 @@ async function monitorIfOnline(names) {
 						//  一直在下架状态, 统计下架持续时间
 						status[name] = {
 							...a,
-							offlineDuration: calDuration(moment.now(), (status[name].offlineDate || moment.now()))
+							offlineDuration: calDuration(moment.now(), (status[name] && status[name].offlineDate || moment.now()))
 						}
 					}
 					a = status[name] || {}