--- redmine_code_review/lib/code_review_application_hooks.rb.orig	2009-11-26 16:31:48.000000000 +0000
+++ redmine_code_review/lib/code_review_application_hooks.rb	2009-11-26 16:32:14.000000000 +0000
@@ -151,6 +151,8 @@
     project = context[:project]
     controller = context[:controller]
     changesets = controller.get_selected_changesets
+    return unless changesets
+
     changeset = changesets[0]
     o = ''
     o << '<script type="text/javascript">' + "\n"