diff --git a/package.json b/package.json
index 951f46d2b3aca276a7060717229580878740f573..913f9b0723bb318f615873fbe28f7705a4fb9cc5 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "wechaty"
-  , "version": "0.2.5"
+  , "version": "0.2.6"
   , "description": "Wechat for Bot. (Personal Account NOT Official Account)"
   , "main": "index.js"
   , "scripts": {
diff --git a/src/puppet-web/watchdog.js b/src/puppet-web/watchdog.js
index 91220e39ec9083be6dd88e60998d3ffcae5af801..32ead3437469b277d24e020e1552db60329ecb7f 100644
--- a/src/puppet-web/watchdog.js
+++ b/src/puppet-web/watchdog.js
@@ -28,20 +28,14 @@ const Watchdog = {
 // feed me in time(after 1st feed), or I'll restart system
 function onFeed({
   data
-  , type = 'GARBAGE'
+  , type = 'HEARTBEAT'
   , timeout = 60000  // 60s default. can be override in options but be careful about the number zero(0)
 } = {}) {
 
   if (!this) {
-    throw new Error('onFeed() must has `this`')
+    throw new Error('onFeed() must has `this` of instanceof PuppetWeb')
   }
 
-  // console.log('#################')
-  // console.log(typeof this)
-  // console.log(this.constructor.name)
-  // console.log(this)
-  // throw new Error('faint')
-
   process.nextTick(_ => {
     log.verbose('PuppetWebWatchdog', 'onFeed: %s, %d, [%s]', type, timeout, data)
 
@@ -50,8 +44,8 @@ function onFeed({
         clearWatchDogTimer.call(this)
         return
 
-      case 'GARBAGE':
       case 'SCAN':
+      case 'HEARTBEAT':
         break
 
       default:
@@ -64,7 +58,7 @@ function onFeed({
 
     monitorScan.call(this, type)
     autoSaveSession.call(this)
-  })
+  }) // end nextTick
 
 }
 
diff --git a/src/wechaty-io.js b/src/wechaty-io.js
index 7cf707e7ce84b4a1bdb44313962540a6bd4b2256..935b92ad4893c5bf194adabcf829b9ea81f7be8d 100644
--- a/src/wechaty-io.js
+++ b/src/wechaty-io.js
@@ -72,7 +72,7 @@ class WechatyIo {
       ws.send('Wechaty version ' + this.wechaty.version())
     }.bind(this))
 
-    ws.on('message', function(data, flags) {
+    ws.on('message', (data, flags) => {
       log.verbose('WechatyIo', 'WebSocket got message')
       // flags.binary will be set if a binary data is received.
       // flags.masked will be set if the data was masked.
@@ -87,7 +87,7 @@ class WechatyIo {
           log.warn('WechatyIo', 'onMessage server push function invalid')
         }
       }
-    }.bind(this))
+    })
 
     ws
     .on('close', e => {