Exception en Google Play Store

[annakozy2011]

Hi, we are receiving these errors in Google Play, all happened on Android 6.0.
Could you look into it? We use the release 1.7 of the module.

java.lang.NullPointerException: Attempt to invoke virtual method 'void nl.vanvianen.android.gcm.GCMModule.sendSuccess(java.lang.String)' on a null object reference
at nl.vanvianen.android.gcm.GCMIntentService.onRegistered(GCMIntentService.java:61)
at com.google.android.gcm.GCMBaseIntentService.handleRegistration(GCMBaseIntentService.java:295)
at com.google.android.gcm.GCMBaseIntentService.onHandleIntent(GCMBaseIntentService.java:197)
at android.app.IntentService$ServiceHandler.handleMessage(IntentService.java:66)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:158)
at android.os.HandlerThread.run(HandlerThread.java:61)