--- a/mercurial/commands.py
+++ b/mercurial/commands.py
@@ -128,13 +128,17 @@ def walkchangerevs(ui, repo, pats, opts)
     if not slowpath:
         # Only files, no patterns.  Check the history of each file.
         def filerevgen(filelog):
+            cl_count = repo.changelog.count()
             for i, window in increasing_windows(filelog.count()-1, -1):
                 revs = []
                 for j in xrange(i - window, i + 1):
                     revs.append(filelog.linkrev(filelog.node(j)))
                 revs.reverse()
                 for rev in revs:
-                    yield rev
+                    # only yield rev for which we have the changelog, it can
+                    # happen while doing "hg log" during a pull or commit
+                    if rev < cl_count:
+                        yield rev
 
         minrev, maxrev = min(revs), max(revs)
         for file_ in files:
@@ -3514,7 +3518,9 @@ def dispatch(args):
         return inst.code
     except:
         u.warn(_("** unknown exception encountered, details follow\n"))
-        u.warn(_("** report bug details to mercurial@selenic.com\n"))
+        u.warn(_("** report bug details to "
+                 "http://www.selenic.com/mercurial/bts\n"))
+        u.warn(_("** or mercurial@selenic.com\n"))
         u.warn(_("** Mercurial Distributed SCM (version %s)\n")
                % version.get_version())
         raise