system-config-lvm hangs after selecting tree items

The program needs to be interrupted with <kbd>Ctrl</kbd>+<kbd>C</kbd>. Example output:

    $ sudo system-config-lvm

    (system-config-lvm.py:7900): IBUS-WARNING **: The owner of /home/richter/.config/ibus/bus is not root!
    ^CTraceback (most recent call last):
      File "/usr/share/system-config-lvm/Volume_Tab_View.py", line 447, in on_tree_selection_changed
        self.on_best_fit(None)
      File "/usr/share/system-config-lvm/Volume_Tab_View.py", line 549, in on_best_fit
        self.__set_zoom_buttons(self.display_view.set_best_fit(self.try_not_best_fit))
      File "/usr/share/system-config-lvm/renderer.py", line 165, in set_best_fit
        pix_w, pix_h, u_label_h = self.display.minimum_pixmap_dimension(self.da)
      File "/usr/share/system-config-lvm/cylinder_items.py", line 453, in minimum_pixmap_dimension
        main_label_dim = layout.get_pixel_size()
    KeyboardInterrupt
    g_dbus_connection_real_closed: Remote peer vanished with error: Underlying GIOStream returned 0 bytes on an async read (g-io-error-quark, 0). Exiting.
    Terminated

reproducible 100 % of the time

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: system-config-lvm 1.1.18-1ubuntu1
Uname: Linux 4.1.1-040101-generic x86_64
ApportVersion: 2.17.2-0ubuntu1.1
Architecture: amd64
CurrentDesktop: Unity
Date: Tue Jun 30 19:52:48 2015
InstallationDate: Installed on 2015-06-08 (22 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: system-config-lvm
UpgradeStatus: Upgraded to vivid on 2015-06-09 (21 days ago)