Tweaktool crashes on launch

[Jeremy Lincicome]

When I launch Tweak-tool, it crashes about thirty seconds after the window comes up. I am using the Orca screen reader. I'm not able to test this visually to see if this only happens while the screen reader is running.
Steps to reproduce:
1. Launch the Orca screen reader by pressing alt+super+s.
2. Open the overview and search for tweak-tool.
3. When Tweak-tool comes up, try to move around the screen using the arrow keys. You should be able to navigate to the bottom of the list.
4. Find the Power item in the list and press CTRL+tab to get to the power options. At this point, Tweak-tool crashes for me. It doesn't matter which item I select from the table.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: gnome-tweak-tool 3.18.1-1
ProcVersionSignature: Ubuntu 4.3.0-7.18-generic 4.3.3
Uname: Linux 4.3.0-7-generic x86_64
ApportVersion: 2.19.3-0ubuntu3
Architecture: amd64
CurrentDesktop: GNOME
Date: Sat Jan 23 22:05:08 2016
InstallationDate: Installed on 2015-11-05 (79 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-tweak-tool
UpgradeStatus: Upgraded to xenial on 2016-01-23 (1 days ago)