Fix B::Index->_backpan_index_has_changed check for remote_mod_time

diff --git a/lib/BackPAN/Index.pm b/lib/BackPAN/Index.pm
index 15cbbf9..df104fe 100644 (file)
--- a/lib/BackPAN/Index.pm
+++ b/lib/BackPAN/Index.pm
@@ -367,7 +367,7 @@ sub _backpan_index_has_changed {
     $self->_backpan_index_file->touch;
 
     my(undef, undef, $remote_mod_time) = head($self->backpan_index_url);
-    return $remote_mod_time > $local_mod_time;
+    return defined $remote_mod_time && $remote_mod_time > $local_mod_time;
 }