fix undef issue

diff --git a/IkiWiki.pm b/IkiWiki.pm
index b70f511757dc2f88fc6b62260004bdea60f9555b..848f1dda8079494d639dac1fd7c1748c58e187cd 100644 (file)
--- a/IkiWiki.pm
+++ b/IkiWiki.pm
@@ -166,7 +166,7 @@ sub loadplugin ($) { #{{{
 
        return if grep { $_ eq $plugin} @{$config{disable_plugins}};
 
-       foreach my $dir (possibly_foolish_untaint($config{libdir}),
+       foreach my $dir (defined $config{libdir} ? possibly_foolish_untaint($config{libdir}) : undef,
                         "$installdir/lib/ikiwiki") {
                if (defined $dir && -x "$dir/plugins/$plugin") {
                        require IkiWiki::Plugin::external;