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java.util.ConcurrentModificationException: 	at java.util.ArrayList$ArrayListIterator.next(ArrayList.java:573)	at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.write(CollectionTypeAdapterFactory.java:95)	at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.write(CollectionTypeAdapterFactory.java:60)	at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write(TypeAdapterRuntimeTypeWrapper.java:68)	at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.write(ReflectiveTypeAdapterFactory.java:113)	at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.write(ReflectiveTypeAdapterFactory.java:240)	at com.google.gson.Gson.toJson(Gson.java:605)	at com.google.gson.Gson.toJson(Gson.java:584)	at com.google.gson.Gson.toJson(Gson.java:539)	at com.google.gson.Gson.toJson(Gson.java:519)	at io.smooch.core.b.a.c.a(Unknown Source)	at io.smooch.core.b.c.a(Unknown Source)	at io.smooch.core.service.SmoochService.n(Unknown Source)	at io.smooch.core.service.SmoochService.c(Unknown Source)	at io.smooch.core.service.SmoochService.a(Unknown Source)	at io.smooch.core.service.SmoochService$10$1.a(Unknown Source)	at io.smooch.core.service.SmoochService$10$1.a(Unknown Source)	at io.smooch.core.b.f$7.a(Unknown Source)	at io.smooch.core.b.a.b$1$2.run(Unknown Source)	at android.os.Handler.handleCallback(Handler.java:739)	at android.os.Handler.dispatchMessage(Handler.java:95)	at android.os.Looper.loop(Looper.java:148)	at android.app.ActivityThread.main(ActivityThread.java:5417)	at java.lang.reflect.Method.invoke(Native Method)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)