java.lang.NullPointerException: Attempt to invoke interface method 'java.util.Set java.util.Map.keySet()' on a null object reference

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    Root Cause Analysis

    1. java.lang.NullPointerException

      Attempt to invoke interface method 'java.util.Set java.util.Map.keySet()' on a null object reference

      at com.google.android.gms.internal.zzanw.zza()
    2. com.google.android
      zzanw.run
      1. com.google.android.gms.internal.zzanw.zza(Unknown Source)
      2. com.google.android.gms.internal.zzanw.run(Unknown Source)
      2 frames
    3. Android Platform
      AsyncTask$SerialExecutor$1.run
      1. android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234)
      1 frame
    4. Java RT
      Thread.run
      1. java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
      2. java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
      3. java.lang.Thread.run(Thread.java:818)
      3 frames