Android CloudPusService.register() 在应用安装后第一次启动时报空指针

如题：
java.lang.NullPointerException: Attempt to invoke interface method 'void com.alibaba.sdk.android.push.CommonCallback.onSuccess(java.lang.String)' on a null object reference

                                                                 at com.alibaba.sdk.android.push.impl.b.onSuccess(Unknown Source)
                                                                 at com.alibaba.sdk.android.push.impl.a.a(Unknown Source)
                                                                 at com.alibaba.sdk.android.push.impl.a$a.a(Unknown Source)
                                                                 at com.alibaba.sdk.android.push.impl.a$a.onPostExecute(Unknown Source)
                                                                 at android.os.AsyncTask.finish(AsyncTask.java:636)
                                                                 at android.os.AsyncTask.access$500(AsyncTask.java:177)
                                                                 at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:653)
                                                                 at android.os.Handler.dispatchMessage(Handler.java:111)
                                                                 at android.os.Looper.loop(Looper.java:194)
                                                                 at android.app.ActivityThread.main(ActivityThread.java:5667)
                                                                 at java.lang.reflect.Method.invoke(Native Method)
                                                                 at java.lang.reflect.Method.invoke(Method.java:372)
                                                                 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:962)
                                                                 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:757)