ZeroDivisionError in GraPhlAn

Hi, am getting this following error when running GraPhlAn 1.1.3

File "/Users/alb/anaconda3/envs/graphlan/bin/", line 79, in <module>
  File "/Users/alb/anaconda3/envs/graphlan/bin/src/", line 945, in draw
  File "/Users/alb/anaconda3/envs/graphlan/bin/src/", line 386, in set_clade_data
    self._varf = varf/tot_dist if self.clade_separation > 0.0 else 0.0
ZeroDivisionError: float division by zero

I am getting this when running this command --dpi 300 --size 7.0 outtree.txt outimg.png --external_legends

I already run the without any error, and this come from the pipeline from Lefse.

Any idea on where this could come from and any help?