Sdkbox Admob FATAL EXCEPTION

Anyone seen this issue from Sdkbox Admob?? Thank you!

4-06 11:19:43.234 5095-5095/? E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.xxx.xxx, PID: 5095
java.lang.NullPointerException
    at com.google.android.gms.ads.internal.a.b(SourceFile:513)
    at com.google.android.gms.ads.internal.b.b(SourceFile:318)
    at com.google.android.gms.ads.internal.a.c(SourceFile:520)
    at com.google.android.gms.ads.internal.aq.run(SourceFile:64)
    at android.os.Handler.handleCallback(Handler.java:733)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:136)
    at android.app.ActivityThread.main(ActivityThread.java:5086)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:515)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
    at dalvik.system.NativeStart.main(Native Method)

how to reproduce ?

Only way I can repro is when it happens in random fashion. Here’s another one from google play console.

java.lang.NullPointerException: 
  at com.google.android.gms.ads.internal.a.b (:com.google.android.gms.alldynamite:513)
  at com.google.android.gms.ads.internal.b.b (:com.google.android.gms.alldynamite:318)
  at com.google.android.gms.ads.internal.a.c (:com.google.android.gms.alldynamite:520)
  at com.google.android.gms.ads.internal.r$1.run (:com.google.android.gms.alldynamite:64)
  at android.os.Handler.handleCallback (Handler.java:815)
  at android.os.Handler.dispatchMessage (Handler.java:104)
  at android.os.Looper.loop (Looper.java:207)
  at android.app.ActivityThread.main (ActivityThread.java:5728)
  at java.lang.reflect.Method.invoke (Native Method)
  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run (ZygoteInit.java:789)
  at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:679)

from the log, here is no relational JAVA code. but i’ll do some Google search.