java.lang.NullPointerException: Attempt to invoke virtual method 'int android.util.SparseBooleanArray.size()' on a null object reference

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Attempt to invoke virtual method 'int android.util.SparseBooleanArray.size()' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'int android.util.SparseBooleanArray.size()' on a null object reference
at esu.uco.rawal.p4rabina.DepartmentActivity.performCall(DepartmentActivity.java:108)
at esu.uco.rawal.p4rabina.DepartmentActivity.access$100(DepartmentActivity.java:18)
at esu.uco.rawal.p4rabina.DepartmentActivity$2.onActionItemClicked(DepartmentActivity.java:85)
at com.android.internal.policy.PhoneWindow$DecorView$ActionModeCallback2Wrapper.onActionItemClicked(PhoneWindow.java:3540)
at com.android.internal.app.WindowDecorActionBar$ActionModeImpl.onMenuItemSelected(WindowDecorActionBar.java:1093)
at com.android.internal.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:761)
at com.android.internal.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:152)
at com.android.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:904)
at android.widget.ActionMenuView.invokeItem(ActionMenuView.java:616)
at android.view.View.performClick(View.java:5198)
at android.view.View$PerformClick.run(View.java:21147)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)

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