firebase issue causing app to crash

[ATY-07]

firebase issue crashing app , can u please fix it

2024-04-25 23:14:18.333 7438-7438 AndroidRuntime com.example.ar_ecommerce E FATAL EXCEPTION: main
Process: com.example.ar_ecommerce, PID: 7438
java.lang.NullPointerException: Can't pass null for argument 'pathString' in child()
at com.google.firebase.database.DatabaseReference.child(DatabaseReference.java:96)
at com.google.firebase.database.DataSnapshot.child(DataSnapshot.java:64)
at com.example.ar_ecommerce.MainActivity$8.onDataChange(MainActivity.java:165)
at com.google.firebase.database.Query$1.onDataChange(Query.java:191)
at com.google.firebase.database.core.ValueEventRegistration.fireEvent(ValueEventRegistration.java:75)
at com.google.firebase.database.core.view.DataEvent.fire(DataEvent.java:63)
at com.google.firebase.database.core.view.EventRaiser$1.run(EventRaiser.java:55)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
2024-04-25 23:14:27.986 7438-7444 art com.example.ar_ecommerce I Debugger is no longer active
2024-04-25 23:14:27.986 7438-7444 art com.example.ar_ecommerce I Starting a blocking GC Instrumentation

[Mudit-pip]

is this issue still relevant?
May i get any additional info for this issue.