NDI shows white screen when no image

I am sending video output from Millumin to another computer through NDI. When I am not sending video, on a blank cue, the image is all white.

I try with another version of Millumin, with another computer and it's fine. I tried on my computer with Resolume and it's fine.

I am using the lastest version of Millumin (3.19.m) with MAC OSX Catalina.

Is there a way to correct the bug? Thank you.