Traceback (most recent call last):
  File "/usr/share/software-center/softwarecenter/ui/gtk3/views/appdetailsview.py", line 189, in _on_cache_ready
    self.show_app(self.app)
  File "/usr/share/software-center/softwarecenter/ui/gtk3/views/appdetailsview_gtk.py", line 1412, in show_app
    self._update_minimal(self.app_details)
  File "/usr/share/software-center/softwarecenter/ui/gtk3/views/appdetailsview_gtk.py", line 1272, in _update_minimal
    self._configure_where_is_it()
  File "/usr/share/software-center/softwarecenter/ui/gtk3/views/appdetailsview_gtk.py", line 1373, in _configure_where_is_it
    self._add_where_is_it_launcher(where)
  File "/usr/share/software-center/softwarecenter/ui/gtk3/views/appdetailsview_gtk.py", line 1310, in _add_where_is_it_launcher
    iconinfo = self.icons.lookup_by_gicon(item.get_icon(), 18, 0)
  File "/usr/lib/python2.7/dist-packages/gi/types.py", line 43, in function
    return info.invoke(*args, **kwargs)
TypeError: Argument 1 does not allow None as a value