java.lang.NullPointerException: Attempt to invoke interface method 'int android.app.FragmentManager$BackStackEntry.getId()' on a null object reference


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Attempt to invoke interface method 'int android.app.FragmentManager$BackStackEntry.getId()' on a null object reference

Stack trace

java.lang.NullPointerException: Attempt to invoke interface method 'int android.app.FragmentManager$BackStackEntry.getId()' on a null object reference
	at co5025.example.com.week10.MainActivity.onClick(MainActivity.java:52)
	at android.view.View.performClick(View.java:5610)
	at android.view.View$PerformClick.run(View.java:22260)
	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:6077)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)

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