Cannot load file due to double TypeError
*Created originally on Bitbucket by [Robert Howlett](https://bitbucket.org/%7B895a262b-c736-4635-975c-15d1279e15f3%7D/)* When attempting to load the attached file with attached script I get a TypeError. Python Version 3.6.0 Openpyxl version 2.5.0a3 ``` Traceback (most recent call last): File "C:\Python36\lib\site-packages\openpyxl\descriptors\base.py", line 57, in _convert value = expected_type(value) TypeError: int() argument must be a string, a bytes-like object or a number, not 'NoneType' During handling of the above exception, another exception occurred: Traceback (most recent call last): File "C:/Projects/gift_for_openpyxl/report_combine.py", line 14, in <module> do_thing("input4.xlsx") File "C:/Projects/gift_for_openpyxl/report_combine.py", line 8, in do_thing wb = openpyxl.load_workbook(xls) # TypeError: expected <class 'int'> File "C:\Python36\lib\site-packages\openpyxl\reader\excel.py", line 274, in load_workbook for c in find_charts(archive, rel.target): File "C:\Python36\lib\site-packages\openpyxl\chart\reader.py", line 52, in find_charts cs = get_rel(archive, deps, rel.id, ChartSpace) File "C:\Python36\lib\site-packages\openpyxl\packaging\relationship.py", line 158, in get_rel obj = cls.from_tree(tree) File "C:\Python36\lib\site-packages\openpyxl\descriptors\serialisable.py", line 83, in from_tree obj = desc.expected_type.from_tree(el) File "C:\Python36\lib\site-packages\openpyxl\descriptors\serialisable.py", line 99, in from_tree return cls(**attrib) File "C:\Python36\lib\site-packages\openpyxl\chart\chartspace.py", line 191, in __init__ self.fmtId = fmtId File "C:\Python36\lib\site-packages\openpyxl\descriptors\nested.py", line 36, in __set__ super(Nested, self).__set__(instance, value) File "C:\Python36\lib\site-packages\openpyxl\descriptors\base.py", line 69, in __set__ value = _convert(self.expected_type, value) File "C:\Python36\lib\site-packages\openpyxl\descriptors\base.py", line 59, in _convert raise TypeError('expected ' + str(expected_type)) TypeError: expected <class 'int'> ``` *Attachments:* [input4.xlsx](/uploads/bb823b46c7f37cf55e85a85de8d492c5/input4.xlsx)[report_combine.py](/uploads/1364cfe68288a72cfb21fdecadd3e7b3/report_combine.py)
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