Traceback (most recent call last):
  File "/usr/bin/gwibber", line 78, in <module>
    GwibberClient()
  File "/usr/lib/python2.6/dist-packages/gwibber/client.py", line 173, in __init__
    self.messages_view = self.add_msg_tab(self.client.receive, _("Messages"), show_icon = "go-home")
  File "/usr/lib/python2.6/dist-packages/gwibber/client.py", line 435, in add_msg_tab
    view = gwui.MessageView(self.preferences["theme"], self)
  File "/usr/lib/python2.6/dist-packages/gwibber/gwui.py", line 60, in __init__
    self.load_theme(theme)
  File "/usr/lib/python2.6/dist-packages/gwibber/gwui.py", line 76, in load_theme
    self.settings.set_property("default-font-size", (int(fsize) + 2))
ValueError: invalid literal for int() with base 10: '6.5'