Tvheadend

As the subject, my xmltv epg is working properly except for the shows which starts before the midnight and ends after (the day after).
I've already check the xmltv file (I use tv_grab_file) and the show is present inside the file but the tvheadend epg simply ignore it (only that show) displaying the next show (which start after midnight).
Is this a known problem?
I've serached around internet find nothing but this which seems to be a problem similar to mine.
Anyone can halp me?

Thankyou