[reportlab-users] strokeColour error weirdness

[Timothy Smith]

when building a line graph, if i put 4 lines on the same graph i get 
this error

AttributeError: LineChartProperties instance has no attribute 'strokeColor'

upon investigating there is indeed 2 lines with out those properties.

[31615.880000000001, 29756.5, 37321.449999999997, 881.70000000000005]
['__doc__', '__getattr__', '__module__', '__setattr__', '_attrMap', 
'_index', '_parent', 'dumpProperties', 'getProperties', 'setProperties', 
'strokeColor', 'verify']
[33000.0, 33000.0, 33000.0, 33000.0]
['__doc__', '__getattr__', '__module__', '__setattr__', '_attrMap', 
'_index', '_parent', 'dumpProperties', 'getProperties', 'setProperties', 
'strokeColor', 'verify']
[31615.880000000001, 29756.5, 37321.449999999997, 881.70000000000005]
['__doc__', '__getattr__', '__module__', '__setattr__', '_attrMap', 
'_index', '_parent', 'dumpProperties', 'getProperties', 'setProperties', 
'verify']
[28656.549999999999, 35045.050000000003, 34189.949999999997, 
37077.300000000003]
['__doc__', '__getattr__', '__module__', '__setattr__', '_attrMap', 
'_index', '_parent', 'dumpProperties', 'getProperties', 'setProperties', 
'verify']

(thats the data + the lines properties)

tell me why does it suddenly make lines without the strokeColour 
property? i'm not doing anything different to the 4 lines :/