--- a/mercurial/verify.py	Wed Jul 13 19:24:54 2011 -0500
+++ b/mercurial/verify.py	Wed Jul 13 16:28:46 2011 -0500
@@ -176,6 +176,8 @@
 
         for f in sorted(filelinkrevs):
             count += 1
+            if m == nullid:
+                continue
             ui.progress(_('crosschecking'), count, total=total)
             if f not in filenodes:
                 lr = filelinkrevs[f][0]