java.lang.NullPointerException: Attempt to invoke virtual method 'android.app.FragmentTransaction android.app.FragmentManager.beginTransaction()' on a null object reference

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  • Android: Fragment manager becomes null
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  • DialogFragment.show() throws NullPointerException
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    • java.lang.NullPointerException: Attempt to invoke virtual method 'android.app.FragmentTransaction android.app.FragmentManager.beginTransaction()' on a null object reference at android.app.DialogFragment.show(DialogFragment.java:228) at in.droom.fragments.HomeScreenFragment.updateUI(HomeScreenFragment.java:553) at in.droom.fragments.HomeScreenFragment.onResponse(HomeScreenFragment.java:626) at in.droom.fragments.HomeScreenFragment.onResponse(HomeScreenFragment.java:100) at in.droom.util.DroomApi$1.onPostExecute(DroomApi.java:1136) at in.droom.util.DroomApi$1.onPostExecute(DroomApi.java:1094) at android.os.AsyncTask.finish(AsyncTask.java:636) at android.os.AsyncTask.access$500(AsyncTask.java:177) at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:653) at android.os.Handler.dispatchMessage(Handler.java:111) at android.os.Looper.loop(Looper.java:194) at android.app.ActivityThread.main(ActivityThread.java:5637) at java.lang.reflect.Method.invoke(Method.java) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:959) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:754)
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