java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v4.app.FragmentManagerImpl.performPendingDeferredStart(android.support.v4.app.Fragment)' on a null object reference

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Attempt to invoke virtual method 'void android.support.v4.app.FragmentManagerImpl.performPendingDeferredStart(android.support.v4.app.Fragment)' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v4.app.FragmentManagerImpl.performPendingDeferredStart(android.support.v4.app.Fragment)' on a null object reference
at android.support.v4.app.FragmentPagerAdapter.setPrimaryItem(FragmentPagerAdapter.java:130)
at android.support.v4.view.ViewPager.populate(ViewPager.java:1175)
at android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:608)
at android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:570)
at fragments.CategoryActivityFragment.onCategoryClicked(CategoryActivityFragment.java:56)
at adapters.CategoriesAdapter$1.onClick(CategoriesAdapter.java:84)
at android.view.View.performClick(View.java:5207)
at android.view.View$PerformClick.run(View.java:21168)
at android.os.Handler.handleCallback(Handler.java:746)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5443)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728)

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