Java.lang.nullpointerexception: Attempt To Invoke Virtual Method 'java.lang.string Com.google.firebase.auth.firebaseuser.getuid()' On A

The following lines of code
String currentUserId;
mAuth = FirebaseAuth.getInstance();
currentUser = mAuth.getCurrentUser();
if(currentUser!= null) { currentUserId = currentUser.getUid(); //Do what you need to do with the id
}

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