title: Error notification appeared when clicking facebook messenger in Notification center(only in android 4.4.4 devices)
body: <h3>【Preconditions】</h3>
  <p>Download facebook messenger</p>
  <h3>【Operation Steps】</h3>
  <p>Download and Install application-&gt; log-in in facebook messenger-&gt; chat with friends-&gt; go to home menu-&gt; open chat in notification center</p>
  <h3>【Actual Results】</h3>
  <p>When clicking facebook messenger in Notification center, an error notification will pop-up stating &quot;Unfortunately, messenger has stopped&quot; and the messenger will not open</p>
  <h3>【Expected Results】</h3>
  <p>When clicking facebook messenger in Notification center, there should be no nitification error will pop-up and the messenger should open immediately.</p>
  <p>logs show:</p>
  <pre><code>10-22 19:52:08.590 22078 22078 E AndroidRuntime: FATAL EXCEPTION: main
  10-22 19:52:08.590 22078 22078 E AndroidRuntime: Process: com.facebook.orca, PID: 22078
  10-22 19:52:08.590 22078 22078 E AndroidRuntime: java.lang.RuntimeException: Unable to start service com.facebook.orca.chatheads.service.ChatHeadService@41cd99a0 with Intent { act=com.facebook.orca.chatheads.ACTION_OPEN_CHAT_HEAD flg=0x10 cmp=com.facebook.orca/.chatheads.service.ChatHeadService (has extras) }: java.lang.NullPointerException
  10-22 19:52:08.590 22078 22078 E AndroidRuntime:  at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:2724)
  10-22 19:52:08.590 22078 22078 E AndroidRuntime:  at android.app.ActivityThread.access$2100(ActivityThread.java:138)
  10-22 19:52:08.590 22078 22078 E AndroidRuntime:  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1301)
  10-22 19:52:08.590 22078 22078 E AndroidRuntime:  at android.os.Handler.dispatchMessage(Handler.java:102)
  10-22 19:52:08.590 22078 22078 E AndroidRuntime:  at android.os.Looper.loop(Looper.java:136)
  10-22 19:52:08.590 22078 22078 E AndroidRuntime:  at android.app.ActivityThread.main(ActivityThread.java:5111)
  10-22 19:52:08.590 22078 22078 E AndroidRuntime:  at java.lang.reflect.Method.invokeNative(Native Method)
  10-22 19:52:08.590 22078 22078 E AndroidRuntime:  at java.lang.reflect.Method.invoke(Method.java:515)
  10-22 19:52:08.590 22078 22078 E AndroidRuntime:  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:818)
  10-22 19:52:08.590 22078 22078 E AndroidRuntime:  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:634)
  10-22 19:52:08.590 22078 22078 E AndroidRuntime:  at dalvik.system.NativeStart.main(Native Method)
  10-22 19:52:08.590 22078 22078 E AndroidRuntime: Caused by: java.lang.NullPointerException
  10-22 19:52:08.590 22078 22078 E AndroidRuntime:  at com.facebook.orca.chatheads.view.bi.a(FloatingChatWindow.java:393)
  10-22 19:52:08.590 22078 22078 E AndroidRuntime:  at com.facebook.orca.chatheads.view.bi.setFocusable(FloatingChatWindow.java:264)
  10-22 19:52:08.590 22078 22078 E AndroidRuntime:  at com.facebook.orca.chatheads.view.bd.a(ChatHeadsFullWindow.java:52)
  10-22 19:52:08.590 22078 22078 E AndroidRuntime:  at com.facebook.orca.chatheads.view.i.aa(ChatHeadWindowManager.java:2719)
  10-22 19:52:08.590 22078 22078 E AndroidRuntime:  at com.facebook.orca.chatheads.view.i.e(ChatHeadWindowManager.java:3526)
  10-22 19:52:08.590 22078 22078 E AndroidRuntime:  at com.facebook.orca.chatheads.view.i.c(ChatHeadWindowManager.java:2909)
  10-22 19:52:08.590 22078 22078 E AndroidRuntime:  at com.facebook.orca.chatheads.view.i.a(ChatHeadWindowManager.java:1204)
  10-22 19:52:08.590 22078 22078 E AndroidRuntime:  at com.facebook.orca.chatheads.service.ChatHeadService.a(ChatHeadService.java:666)
  10-22 19:52:08.590 22078 22078 E AndroidRuntime:  at com.facebook.orca.chatheads.service.ChatHeadService.g(ChatHeadService.java:541)
  10-22 19:52:08.590 22078 22078 E AndroidRuntime:  at com.facebook.orca.chatheads.service.ChatHeadService.onStartCommand(ChatHeadService.java:450)
  10-22 19:52:08.590 22078 22078 E AndroidRuntime:  at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:2707)
  10-22 19:52:08.590 22078 22078 E AndroidRuntime:  ... 10 more
  </code></pre>