System Information
Operating system: Kubuntu 19.04
Graphics card: Nivida GeForce 970

Blender Version
Broken: recent commit on master

Short description of error

Traceback (most recent call last):

File "/home/cory/Source/Blender/build_linux_full/bin/2.80/scripts/startup/bl_ui/space_image.py", line 163, in draw
  layout.operator("uv.select_linked").extend = False

AttributeError: 'UV_OT_select_linked' object has no attribute 'extend'

Exact steps for others to reproduce the error

Hopefully self evident. Occurs on exit.