=== modified file 'lib/util.py'
--- lib/util.py	2011-07-10 22:28:39 +0000
+++ lib/util.py	2012-01-06 11:35:49 +0000
@@ -1121,7 +1121,7 @@
             tab_width_chars = 8
     else:
         if branch:
-            branch.get_config().set_user_option("tab_width", tab_width_chars)
+            branch.get_config().set_user_option("tab_width", str(tab_width_chars))
 
     return tab_width_chars