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Attempt to invoke interface method 'java.util.Iterator java.util.List.iterator()' on a null object reference
java.lang.NullPointerException: Attempt to invoke interface method 'java.util.Iterator java.util.List.iterator()' on a null object reference	at com.dieam.reactnativepushnotification.modules.RNPushNotificationListenerService.isApplicationRunning(RNPushNotificationListenerService.java:56)	at com.dieam.reactnativepushnotification.modules.RNPushNotificationListenerService.sendNotification(RNPushNotificationListenerService.java:41)	at com.dieam.reactnativepushnotification.modules.RNPushNotificationListenerService.onMessageReceived(RNPushNotificationListenerService.java:28)	at com.google.android.gms.gcm.GcmListenerService.zzq(Unknown Source)	at com.google.android.gms.gcm.GcmListenerService.zzp(Unknown Source)	at com.google.android.gms.gcm.GcmListenerService.zzo(Unknown Source)	at com.google.android.gms.gcm.GcmListenerService.zza(Unknown Source)	at com.google.android.gms.gcm.GcmListenerService$1.run(Unknown Source)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)	at java.lang.Thread.run(Thread.java:818)