nais2pg cursor issue

InterfaceError: cursor already closed
Traceback (most recent call last):
  File "./nais2pg.py", line 785, in run
    self.loop()
  File "./nais2pg.py", line 841, in loop
    self.pos_cache.update(msg)
  File "./nais2pg.py", line 597, in update
    self.cu.execute(self.sql_update_with_track, new_pos)
InterfaceError: cursor already closed