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ERROR: kotlin.KotlinNullPointerException

ERROR:

2021-04-03 16:15:29.154 8569-8569/? E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.erikpersson.quickdraw, PID: 8569
    kotlin.KotlinNullPointerException
        at com.example.quickdraw.viewmodels.MainMenuViewModel.getGameIDs(MainMenuViewModel.kt:47)
        at com.example.quickdraw.fragments.MainMenuFragment.onStart(MainMenuFragment.kt:55)

MainMenuViewModel.kt:47: val databaseRef = Firebase.database.reference.child("Users").child(Firebase.auth.uid!!)

Please describe how to fix this. If it's related to Firebase configuration, guide on how to solve it.

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