DialogFragment sometimes throws weird exception on android -


i have stateless dialog fragment throws
attempt invoke virtual method 'android.support.v4.app.fragmenttransaction android.support.v4.app.fragmentmanager.begintransaction()' on null object reference exception on dismissallowingstateloss call.the line within dialogfragment class throws exception 

fragmenttransaction ft = getfragmentmanager().begintransaction();

apparently getfragmentmanager() returns null.what cases when can happen?


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