error: null src bitmap in grub_video_bitmap_create_scaled.

[mateosss]

On some installations this error appears sparingly. I'll let this issue here for anyone that gets it.

The same error mentioned in this project: grml/grml#16
and they seem to solve it by replacing the property desktop-color for desktop-image in theme.txt and a tiny png.

It would be nice to be able to reproduce this issue and then solve it.

I can reproduce this. (Or better, I was able to reproduce it until I used the -im parameter to set a background image, which sounds like the solution from the other project)
Anything I could provide to help? (like sending logs or system information. I doubt I can debug this myself)