Traceback (most recent call last):
  File "/usr/share/gnome-activity-journal/src/activity_widgets.py", line 135, in update_day
    page.set_day(day)
  File "/usr/share/gnome-activity-journal/src/activity_widgets.py", line 202, in set_day
    self.dayviews[1].set_items(afternoon)
  File "/usr/share/gnome-activity-journal/src/activity_widgets.py", line 273, in set_items
    box = CategoryBox(None, ungrouped_events)
  File "/usr/share/gnome-activity-journal/src/activity_widgets.py", line 365, in __init__
    _set_up_box()
  File "/usr/share/gnome-activity-journal/src/activity_widgets.py", line 298, in _set_up_box
    item = Item(struct, pinnable, True)
  File "/usr/share/gnome-activity-journal/src/activity_widgets.py", line 402, in __init__
    can_thumb=settings.get('small_thumbnails', False), border=0)
  File "/usr/share/gnome-activity-journal/src/common.py", line 875, in get_icon
    icon = gtk.gdk.pixbuf_new_from_file_at_size(location, size, size)
TypeError: pixbuf_new_from_file_at_size() argument 1 must be string, not None