android - Google Sign In crash: Caused by: java.util.ConcurrentModificationException -


my app has started crashing during google sign in process.

it wasn't crashing before.

could connected changing google play services version?

what else cause crash?

i able stop before delaying when implement onesignal initialization in application class. but, not sure how connected , have come across connection because of trial , error. changing onesignal implementation doesn't seem proper solution sidesteps problem wasn't occurring before , may occur again if don't find more specific cause it.

also, crash doesn't occur during sign in process.

the main clues logcat seem be: 

 error occurred while executing doinbackground() caused by: java.util.concurrentmodificationexception @ com.google.android.gms.auth.api.signin.internal.zzb.zzafx(unknown source) @ com.google.android.gms.auth.api.signin.internal.zzb.loadinbackground(unknown source)

here full logcat:

uncaughtexception: java.lang.runtimeexception: error occurred while executing doinbackground()                                                                                                     @ android.support.v4.content.modernasynctask$3.done(modernasynctask.java:142)                                                                                                     @ java.util.concurrent.futuretask.finishcompletion(futuretask.java:355)                                                                                                     @ java.util.concurrent.futuretask.setexception(futuretask.java:222)                                                                                                     @ java.util.concurrent.futuretask.run(futuretask.java:242)                                                                                                     @ java.util.concurrent.threadpoolexecutor.runworker(threadpoolexecutor.java:1112)                                                                                                     @ java.util.concurrent.threadpoolexecutor$worker.run(threadpoolexecutor.java:587)                                                                                                     @ java.lang.thread.run(thread.java:818)                                                                                                  caused by: java.util.concurrentmodificationexception                                                                                                     @ java.util.weakhashmap$hashiterator.next(weakhashmap.java:165)                                                                                                     @ com.google.android.gms.auth.api.signin.internal.zzb.zzafx(unknown source)                                                                                                     @ com.google.android.gms.auth.api.signin.internal.zzb.loadinbackground(unknown source)                                                                                                     @ android.support.v4.content.asynctaskloader.onloadinbackground(asynctaskloader.java:296)                                                                                                     @ android.support.v4.content.asynctaskloader$loadtask.doinbackground(asynctaskloader.java:54)                                                                                                     @ android.support.v4.content.asynctaskloader$loadtask.doinbackground(asynctaskloader.java:42)                                                                                                     @ android.support.v4.content.modernasynctask$2.call(modernasynctask.java:128)                                                                                                     @ java.util.concurrent.futuretask.run(futuretask.java:237)                                                                                                     @ java.util.concurrent.threadpoolexecutor.runworker(threadpoolexecutor.java:1112)                                                                                                      @ java.util.concurrent.threadpoolexecutor$worker.run(threadpoolexecutor.java:587)                                                                                                      @ java.lang.thread.run(thread.java:818) `11-11 00:35:53.023 11247-11903/com.example.package e/androidruntime: fatal exception: modernasynctask #1                                                                                              process: com.example.package, pid: 11247                                                                                              java.lang.runtimeexception: error occurred while executing doinbackground()                                                                                                  @ android.support.v4.content.modernasynctask$3.done(modernasynctask.java:142)                                                                                                  @ java.util.concurrent.futuretask.finishcompletion(futuretask.java:355)                                                                                                  @ java.util.concurrent.futuretask.setexception(futuretask.java:222)                                                                                                  @ java.util.concurrent.futuretask.run(futuretask.java:242)                                                                                                  @ java.util.concurrent.threadpoolexecutor.runworker(threadpoolexecutor.java:1112)                                                                                                  @ java.util.concurrent.threadpoolexecutor$worker.run(threadpoolexecutor.java:587)                                                                                                  @ java.lang.thread.run(thread.java:818)                                                                                               caused by: java.util.concurrentmodificationexception                                                                                                  @ java.util.weakhashmap$hashiterator.next(weakhashmap.java:165)                                                                                                  @ com.google.android.gms.auth.api.signin.internal.zzb.zzafx(unknown source)                                                                                                  @ com.google.android.gms.auth.api.signin.internal.zzb.loadinbackground(unknown source)                                                                                                  @ android.support.v4.content.asynctaskloader.onloadinbackground(asynctaskloader.java:296)                                                                                                  @ android.support.v4.content.asynctaskloader$loadtask.doinbackground(asynctaskloader.java:54)                                                                                                  @ android.support.v4.content.asynctaskloader$loadtask.doinbackground(asynctaskloader.java:42)                                                                                                  @ android.support.v4.content.modernasynctask$2.call(modernasynctask.java:128)                                                                                                  @ java.util.concurrent.futuretask.run(futuretask.java:237)                                                                                                  @ java.util.concurrent.threadpoolexecutor.runworker(threadpoolexecutor.java:1112)                                                                                                   @ java.util.concurrent.threadpoolexecutor$worker.run(threadpoolexecutor.java:587)                                                   `                                                @ java.lang.thread.run(thread.java:818)

thanks in advance.


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