Screaming yellow lightmap?

I left the computer lightmapping overnight at the office and returned to this?
Does anyone have a clue whats wrong? And no there is no giant yellow light in the scene, just a normal directional light with a slight orange tint which has worked out fine before!
Ambient light from a skybox thats mostly blue and clouds.

I found a solution that worked to me:

I you go to Window>Lighting and go to the bottom part and check “Auto Generate” (Or able and disable it) it will re-bake the lighting and then fix the color issue.
This worked for me, but I don’t know if it will work for you.
Hope it does,