ConfigEditorColour wrong color on reopen

[xXxNIKIxXx]

I am using this setup, and I can set a color. When I reopen the config, the color is displayed in the little window. However, when I attempt to change the color, the color picker shows a full black (0, 0, 0) color.

@ConfigOption(name = "Render Color", desc = "Define the color in wich an Block outline in drawn around the Block.")
@ConfigEditorColour
@Expose
public String colour = "0:0:0:0:0";