Index: contrib/gtk_theme.py
==================================================================
--- contrib/gtk_theme.py
+++ contrib/gtk_theme.py
@@ -87,10 +87,10 @@
         themes = ["default"] + sorted(themes)
         
         # add to list
         for t in themes:
             cb.ls.append([t, t])
-        if conf.theme in themes:
+        if ("theme" in conf) and (conf.theme in themes):
             cb.set_default(conf.theme)
         else:
             cb.set_default("default")