diff -r 034f444902d9 -r be55b1a6d4b1 mercurial/hgweb/webcommands.py
--- a/mercurial/hgweb/webcommands.py	Thu Jun 12 07:38:15 2008 -0500
+++ b/mercurial/hgweb/webcommands.py	Fri Jun 13 12:34:23 2008 +0200
@@ -538,7 +538,7 @@
 
 
 def archive(web, req, tmpl):
-    type_ = req.form['type'][0]
+    type_ = req.form.get('type', [None])[0]
     allowed = web.configlist("web", "allow_archive")
     key = req.form['node'][0]