我已将Firebase升级到版本5.1.1，并将此崩溃记录在Crashlytics中 .

Fatal Exception: java.lang.Error
    FATAL EXCEPTION [main] Unity version : 5.6.6f2 Device model : verykool verykoolSL5029 Device fingerprint: verykool/verykoolSL5029/verykoolSL5029:7.0/NRD90M/1509673137:user/release-keys

Caused by java.lang.NullPointerException
Attempt to invoke interface method 'int java.util.List.size()' on a null object reference

com.google.firebase.app.internal.cpp.GoogleApiAvailabilityHelper$2$1.run (GoogleApiAvailabilityHelper.java:113)
java.lang.Thread.run (Thread.java:761)
com.google.firebase.app.internal.cpp.GoogleApiAvailabilityHelper$2.onDismiss (GoogleApiAvailabilityHelper.java:151)
android.app.Dialog$ListenersHandler.handleMessage (Dialog.java:1347)
android.os.Handler.dispatchMessage (Handler.java:110)
android.os.Looper.loop (Looper.java:203)
android.app.ActivityThread.main (ActivityThread.java:6251)
java.lang.reflect.Method.invoke (Method.java)
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run (ZygoteInit.java:1063)
com.android.internal.os.ZygoteInit.main (ZygoteInit.java:924)

有人有主意吗 ？

firebase unity3d