I am working on Android app. 

I created a FireBase database which holds the information of registered user.

As you can see in the picture, I created costume key for users in my database which are users `User UID` in authentication section. When user logged in, I get `User UID` and find its information in my `FireBase` database directly from root node to that particular node which always gives me the null value. 

Kindly help me out. 

If you can upload a code snippet, that would be highly appreciated.

![Database sample and location of problem](https://i.stack.imgur.com/6PWQ8.png).