Segmentations not drawing on volume

At random, when i try to edit a newly created segmentation with the paint or draw effect, the segmentation map does not update at all. The error log shows:

Input port 0 of algorithm vtkImageMapToWindowLevelColors(000002564BEED4C0) has 0 connections but is not optional.

I usually have to restart slicer and then it works!

Can you send the complete application log? (menu: Help / Report a bug)