convert_color crash in 2.0.2

[protogeezer]

I found the following crash...

convert_color(LCHabColor(40.,104.,40.),AdobeRGBColor)

ValueError Traceback (most recent call last)
in ()
----> 1 convert_color(LCHabColor(40.,104.,40.),AdobeRGBColor)

/Users/sjbespa/Library/Enthought/Canopy_64bit/User/lib/python2.7/site-packages/colormath/color_conversions.py in convert_color(color, target_cs, through_rgb_type, target_illuminant, _args, *_kwargs)
970 target_rgb=target_rgb,
971 target_illuminant=target_illuminant,
--> 972 _args, *_kwargs)
973
974 logger.debug(' |-< out %s', new_color)

/Users/sjbespa/Library/Enthought/Canopy_64bit/User/lib/python2.7/site-packages/colormath/color_conversions.py in XYZ_to_RGB(cobj, target_rgb, _args, *_kwargs)
375 for channel in ['r', 'g', 'b']:
376 v = linear_channels[channel]
--> 377 nonlinear_channels[channel] = math.pow(v, 1 / target_rgb.rgb_gamma)
378
379 return target_rgb(

ValueError: math domain error