Error in using dump2xyz.py for voronoi dump output

hi I am using python tools as provided along the distribution. while using dump2xyz.py tool for extracting vacancy coordinates form the dump output I am facing following error, can someone explain it ?
Traceback (most recent call last):
File “/usr/local/Cellar/lammps/20220623/share/lammps/tools/python/dump2xyz.py”, line 29, in
d = dump(dumpfile)
File “/usr/local/Cellar/lammps/20220623/share/lammps/tools/python/pizza/dump.py”, line 233, in init
self.read_all()
File “/usr/local/Cellar/lammps/20220623/share/lammps/tools/python/pizza/dump.py”, line 277, in read_all
print(“assigned columns:”,self.names2str())
File “/usr/local/Cellar/lammps/20220623/share/lammps/tools/python/pizza/dump.py”, line 573, in names2str
ncol = len(self.snaps[0].atoms[0])
TypeError: ‘NoneType’ object has no attribute ‘getitem
your response will be highly appreciated