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java.util.ConcurrentModificationException: 	at java.util.LinkedHashMap$LinkedHashIterator.nextEntry(LinkedHashMap.java:346)	at java.util.LinkedHashMap$KeyIterator.next(LinkedHashMap.java:366)	at com.onesignal.OneSignalStateSynchronizer.generateJsonDiff(OneSignalStateSynchronizer.java:74)	at com.onesignal.OneSignalStateSynchronizer.access$200(OneSignalStateSynchronizer.java:46)	at com.onesignal.OneSignalStateSynchronizer$UserState.generateJsonDiff(OneSignalStateSynchronizer.java:263)	at com.onesignal.OneSignalStateSynchronizer$UserState.access$000(OneSignalStateSynchronizer.java:197)	at com.onesignal.OneSignalStateSynchronizer.syncUserState(OneSignalStateSynchronizer.java:476)	at com.onesignal.OneSignalStateSynchronizer$NetworkHandlerThread$1.run(OneSignalStateSynchronizer.java:440)	at android.os.Handler.handleCallback(Handler.java:739)	at android.os.Handler.dispatchMessage(Handler.java:95)	at android.os.Looper.loop(Looper.java:158)	at android.os.HandlerThread.run(HandlerThread.java:61)