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Attempt to invoke virtual method 'java.lang.String com.google.firebase.auth.FirebaseUser.getUid()' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String com.google.firebase.auth.FirebaseUser.getUid()' on a null object reference	at com.example.learnwords.Navigation.checkUser(Navigation.java:247)	at com.example.learnwords.Navigation$1.onAuthStateChanged(Navigation.java:87)	at com.google.firebase.auth.FirebaseAuth$1.run(Unknown Source)	at android.os.Handler.handleCallback(Handler.java:746)	at android.os.Handler.dispatchMessage(Handler.java:95)	at android.os.Looper.loop(Looper.java:148)	at android.app.ActivityThread.main(ActivityThread.java:5443)	at java.lang.reflect.Method.invoke(Native Method)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)