diff -r 51e52db6b40d -r 719488a98ebe mercurial/ui.py
--- a/mercurial/ui.py	Thu Feb 15 08:51:32 2007 -0200
+++ b/mercurial/ui.py	Thu Feb 15 10:15:08 2007 -0200
@@ -309,7 +309,7 @@
         sections.sort()
         for section in sections:
             for name, value in self.configitems(section, untrusted):
-                yield section, name, value.replace('\n', '\\n')
+                yield section, name, str(value).replace('\n', '\\n')
 
     def extensions(self):
         result = self.configitems("extensions")