java.lang.NullPointerException: Attempt to invoke interface method 'java.lang.Object[] java.util.Collection.toArray()' on a null object reference
	at java.util.ArrayList.addAll(ArrayList.java:193)
	at com.entitcs.office_attendance.activities.LeaveManagement$h.onPostExecute(SourceFile)
	at android.os.AsyncTask.finish(AsyncTask.java:651)
	at android.os.AsyncTask.access$500(AsyncTask.java:180)
	at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:668)
	at android.os.Handler.dispatchMessage(Handler.java:111)
	at android.os.Looper.loop(Looper.java:207)
	at android.app.ActivityThread.main(ActivityThread.java:5857)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1026)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:887)