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java.util.ConcurrentModificationException: 	at java.util.HashMap$HashIterator.nextEntry(HashMap.java:792)	at java.util.HashMap$EntryIterator.next(HashMap.java:829)	at java.util.HashMap$EntryIterator.next(HashMap.java:827)	at org.json.JSONObject.writeTo(JSONObject.java:666)	at org.json.JSONObject.toString(JSONObject.java:636)	at com.onesignal.OneSignalStateSynchronizer$UserState.persistState(OneSignalStateSynchronizer.java:269)	at com.onesignal.OneSignalStateSynchronizer$UserState.access$000(OneSignalStateSynchronizer.java:124)	at com.onesignal.OneSignalStateSynchronizer.syncUserState(OneSignalStateSynchronizer.java:359)	at com.onesignal.OneSignalStateSynchronizer$NetworkHandlerThread$1.run(OneSignalStateSynchronizer.java:314)	at android.os.Handler.handleCallback(Handler.java:615)	at android.os.Handler.dispatchMessage(Handler.java:92)	at android.os.Looper.loop(Looper.java:137)	at android.os.HandlerThread.run(HandlerThread.java:60)