--- nautilus-bzr.py	2011-06-23 23:26:05.582291343 +1000
+++ nautilus-bzr_beetroot.py	2011-06-23 23:40:14.950291858 +1000
@@ -226,6 +226,9 @@ class BzrExtension(nautilus.MenuProvider
         file = vfs_file.get_uri()
 
         try:
+            if vfs_file.get_uri_scheme() == 'sftp':
+                raise UnsupportedProtocol(file, 'sftp not supported by nautilus-bzr')
+
             tree, path = WorkingTree.open_containing(file)
             disabled_flag = self.check_branch_enabled(tree.branch)
         except UnsupportedProtocol: