Cycles - Baking Diffuse result is always black I already try for hours to bake a diffuse map from multiple textures, but the result is always black. 

This is my material:



I want to bake it, I already managed it earlier without any problems to bake the diffuse texture, but now suddenly the only result I get is black.

Here is my node setup for the material which I need to bake. I try to save the result in the node at the top left.

NOTE: I know the Principled BSDF shader settings make no sense, I was just playing around to see if this makes a difference in the bake...

How I tried it:


Selected the object
Created a new uv-image
Create Texture node in my material and set the uv-image as source
Select that node (yellow border)
Bake diffuse


Result:



There are many lamps in the scene:
I found the problem. After setting Subsurface to 0 in the Principled BSDF Shader, it works. I can't explain it though.