Intermittent glade error

Once in a while, when running Caffeine, I run into a strange stack trace:

./caffeine

Traceback (most recent call last):
  File "./caffeine", line 40, in <module>
    caffeine.main()
  File "./../caffeine/main.py", line 265, in main
    main = GUI()
  File "./../caffeine/main.py", line 57, in __init__
    "GUI.glade"))
glib.GError: Duplicate object id 'label1' on line 259 (previously on line 188)

After recieving this error, I ran Caffeine again and it ran normally. This could be a problem specific to my computer, as I have updated some GTK-related packages in order to install Glade, so I will mark it as very low priority for now. Has anyone else seen this?