Android应用已投放生产，我们收到此错误，因为firebase和google-play的版本为10.2.0。更新确实帮助了我们。
Fatal Exception: java.lang.RuntimeException: Uncaught exception in Firebase Database runloop (3.0.0). Please report to firebase-database-client@google.com
at com.google.android.gms.internal.zzbnv$1$1.run(Unknown Source)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:158)
at android.app.ActivityThread.main(ActivityThread.java:7229)
at java.lang.reflect.Method.invoke(Method.java)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
Caused by java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.remove(HashMap.java:806)
at bok.l(:com.google.android.gms.DynamiteModulesC:661)
at bok.a(:com.google.android.gms.DynamiteModulesC:401)
at bny.a(:com.google.android.gms.DynamiteModulesC:82)
at bny.a(:com.google.android.gms.DynamiteModulesC:14087)
at bpb.c(:com.google.android.gms.DynamiteModulesC:319)
at bpk.run(:com.google.android.gms.DynamiteModulesC:3309)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:423)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:154)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:269)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
at java.lang.Thread.run(Thread.java:818)
库：
compile 'com.google.firebase:firebase-database:10.2.1'
compile 'com.google.firebase:firebase-auth:10.2.1'
compile 'com.google.android.gms:play-services-places:10.2.1'