hgext/fetch.py

--- a/hgext/fetch.py	Sun May 13 16:39:40 2012 +0200
+++ b/hgext/fetch.py	Sun May 13 14:04:04 2012 +0200
@@ -38,7 +38,10 @@
 
     parent, p2 = repo.dirstate.parents()
     branch = repo.dirstate.branch()
-    branchnode = repo.branchtags().get(branch)
+    try:
+        branchnode = repo.branchtip(branch)
+    except error.RepoLookupError:
+        branchnode = None
     if parent != branchnode:
         raise util.Abort(_('working dir not at branch tip '
                            '(use "hg update" to check out branch tip)'))