Undefined index errors

When saving settings for rootcandy I get the following errors although it seems to save correctly anyway:

Error message
Notice: Undefined index: base in _color_render_images() (line 516 of /home/quickstart/websites/business.dev/modules/color/color.module).
Notice: Undefined index: base in _color_rewrite_stylesheet() (line 452 of /home/quickstart/websites/business.dev/modules/color/color.module).