Wierd Lighting from wall

Hey guys, I´ve been getting this kind of light from my walls. So I´m wondering if there is anything I can do? I´ve been trying to switch on/off Shadow/Light/Geometry Two sided but with no luck. Or is it just because the walls are simple planes?

Hey, did you try increasing the lightmap resolution of the wall, and floor ?
Bump it to 512 or even 1024.

Yeah, I tried both 512 and 1024 but no change

Try to make tha walls thicker. If you only use a single plane, often you get this artefacts.

Okey, I got it to work. I just had to make the walls and floor thicker! So dumb to be lazy haha.

Thanks for answers!