No problem. I think it’s the same issue reported here:
Is it possible that your variables were saved in a color palette, but the palette itself no longer exists, and you have now defined the colors somewhere else (in the variable manager, for example)?
If so, this is because each color palette color is assigned a unique ID. This ID is also saved in the element settings to which you assigned the color. If you delete the palette, the color ID will remain in the element settings, which will probably lead to the problem.