In the CompositorOperation::deinitExecution the viewer could be freed at the same time it was drawn in the image editor or node editor. There is a guard for that but wasn't added during the migration of the two editors to the draw manager.
In the CompositorOperation::deinitExecution the viewer could be freed at the same time it was drawn in the image editor or node editor. There is a guard for that but wasn't added during the migration of the two editors to the draw manager.