Aseprite crashes / misbehaves when clicking on scroll bar

v1.3-beta6-x64, win10

to select gradients you have to click on an arrow (not an image or name of gradient) to be able to open menu.

when you are about to set pattern in brush settings menu (pressure / velocity), clicking on scrollbar shuts down aseprite completely.

when you do the same for gradient tool, the menu only closes (so it doesn’t work, but aseprite doesn’t crash).