java.lang.NullPointerException: Attempt to invoke virtual method 'boolean elektro_fr.my_android.ui.My_Fragment.isAdded()' on a null object reference

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Attempt to invoke virtual method 'boolean elektro_fr.my_android.ui.My_Fragment.isAdded()' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'boolean elektro_fr.my_android.ui.My_Fragment.isAdded()' on a null object reference
at elektro_fr.my_android.ui.My_Activity.removeFragment(My_Activity.java:296)
at elektro_fr.newapplication.Compito.Fragment.MainActivity.clickButtonOperation(MainActivity.java:62)
at elektro_fr.newapplication.Compito.Fragment.Fragment_2.setGraphics(Fragment_2.java:35)
at elektro_fr.my_android.ui.My_Fragment.onCreateView(My_Fragment.java:66)

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