Shadows show up in diffuse pass

I’m running into a problem with compositing as far as shadow pass multiplication goes. Whenever I render a diffuse pass I also get a faint outline of the shadow pass. You can see the problem here:

http://i28.photobucket.com/albums/c243/ZapperJet/diffuse_pass_error.png

This is only the diffuse pass. The error only occurs when there are textures applied as color. Plane materials with a diffuse color do not do this. Any fix for this?

Cheers,
John

Ok I figured out that this error is a result of transparent shadow in the material options. It is a bug then.

Cheers,
John