java.util.ConcurrentModificationException
```
java.lang.RuntimeException:Unable to start receiver cn.jpush.im.android.helpers.IMReceiver: java.util.ConcurrentModificationException
android.app.ActivityThread.handleReceiver(ActivityThread.java:2738)
Caused by:
java.util.ConcurrentModificationException:
java.util.ArrayList$ArrayListIterator.next(ArrayList.java:573)
cn.jpush.im.android.helpers.c.a(MessageSendingMaintainer.java)
cn.jpush.im.android.helpers.f.a(RequestProcessor.java)
cn.jpush.im.android.api.JMessageClient.logout(JMessageClient.java)
cn.jpush.im.android.c.b.a.b.ac.b(ImBaseRequest.java)
cn.jpush.im.android.helpers.g.a(ResponseProcessor.java)
cn.jpush.im.android.helpers.IMReceiver.onReceive(IMReceiver.java)
android.app.ActivityThread.handleReceiver(ActivityThread.java:2731)
android.app.ActivityThread.-wrap14(ActivityThread.java)
android.app.ActivityThread$H.handleMessage(ActivityThread.java:1424)
android.os.Handler.dispatchMessage(Handler.java:102)
android.os.Looper.loop(Looper.java:148)
android.app.ActivityThread.main(ActivityThread.java:5426)
java.lang.reflect.Method.invoke(Native Method)
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:772)