java.lang.NullPointerException

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    • 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) at android.support.v4.app.Fragment.performCreateView(Fragment.java:1974)
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