java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String com.example.earning.model.ProfileModel.getName()' on a null object

Question

E FATAL EXCEPTION: main Process: com.example.earning, PID: 6950 java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String com.example.earning.model.ProfileModel.getName()' on a null object reference at com.example.earning.MainActivity$3.onDataChange(MainActivity.java:112)