集成极光flutter插件，有知道这个问题的嘛

java.lang.RuntimeException: Unable to start receiver com.jiguang.jpush.JPushPlugin$JPushReceiver: java.lang.NullPointerException: Attempt to invoke virtual method 'void io.flutter.plugin.common.MethodChannel.invokeMethod(java.lang.String, java.lang.Object)' on a null object reference
E/AndroidRuntime(25374): at android.app.ActivityThread.handleReceiver(ActivityThread.java:4354)
E/AndroidRuntime(25374): at android.app.ActivityThread.access$1600(ActivityThread.java:265)
E/AndroidRuntime(25374): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2156)
E/AndroidRuntime(25374): at android.os.Handler.dispatchMessage(Handler.java:106)
E/AndroidRuntime(25374): at android.os.Looper.loop(Looper.java:239)
E/AndroidRuntime(25374): at android.app.ActivityThread.main(ActivityThread.java:8142)
E/AndroidRuntime(25374): at java.lang.reflect.Method.invoke(Native Method)
E/AndroidRuntime(25374): at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:626)
E/AndroidRuntime(25374): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1015)