java.lang.NullPointerException: Attempt to invoke virtual method 'android.text.Editable android.widget.EditText.getText()' on a null object reference

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Attempt to invoke virtual method 'android.text.Editable android.widget.EditText.getText()' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'android.text.Editable android.widget.EditText.getText()' on a null object reference
at lab.klunigs.all_in_one.MainForDialog.onSaveButtonClick(MainForDialog.java:63)
at lab.klunigs.all_in_one.AddStudentDialog$2.onClick(AddStudentDialog.java:63)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)

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