about log-terminal

When I set --log-terminal=True, the following error is occur

self.epoch_bar = progressbar.ProgressBar(maxval=n_epochs, fd=Writer(self.t, (0, h-s+e)))

TypeError: unsupported operand type(s) for -: 'NoneType' and 'int'

and I find that in logger.py line16,   h = self.t.height,  then the h is None

Could you help me with this? Thank you very much