ValueError: Min value is 0

Created originally on Bitbucket by adoyskywalker (Ding Li)

I tried to read the attached workbook using openpyxl 2.5.1 but got an error ValueError: Min value is 0. Could you please help resolve the issue? The read script is below. thanks

#!python

Python 3.6.4 (default, Jan 30 2018, 14:37:12) 
[GCC 6.3.0 20170406] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import openpyxl
>>> wb=openpyxl.load_workbook('a.xlsm')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/ding/projects/nexant/pacwsb/lib/python3.6/site-packages/openpyxl/reader/excel.py", line 273, in load_workbook
    for c in find_charts(archive, rel.target):
  File "/home/ding/projects/nexant/pacwsb/lib/python3.6/site-packages/openpyxl/chart/reader.py", line 48, in find_charts
    drawing = SpreadsheetDrawing.from_tree(tree)
  File "/home/ding/projects/nexant/pacwsb/lib/python3.6/site-packages/openpyxl/descriptors/serialisable.py", line 84, in from_tree
    obj = desc.expected_type.from_tree(el)
  File "/home/ding/projects/nexant/pacwsb/lib/python3.6/site-packages/openpyxl/descriptors/serialisable.py", line 84, in from_tree
    obj = desc.expected_type.from_tree(el)
  File "/home/ding/projects/nexant/pacwsb/lib/python3.6/site-packages/openpyxl/descriptors/serialisable.py", line 84, in from_tree
    obj = desc.expected_type.from_tree(el)
  File "/home/ding/projects/nexant/pacwsb/lib/python3.6/site-packages/openpyxl/descriptors/serialisable.py", line 100, in from_tree
    return cls(**attrib)
  File "/home/ding/projects/nexant/pacwsb/lib/python3.6/site-packages/openpyxl/drawing/fill.py", line 94, in __init__
    self.t = t
  File "/home/ding/projects/nexant/pacwsb/lib/python3.6/site-packages/openpyxl/descriptors/base.py", line 109, in __set__
    raise ValueError('Min value is {0}'.format(self.min))
ValueError: Min value is 0
>>> 

Attachments: a.xlsm