see subject, simple patch below

--- a/IkiWiki/Plugin/inline.pm
+++ b/IkiWiki/Plugin/inline.pm
@@ -371,7 +371,8 @@ sub preprocess_inline (@) {
          }
          if (length $config{cgiurl} && defined $type) {
            $template->param(have_actions => 1);
-           $template->param(editurl => cgiurl(do => "edit", page => $page));
+           $template->param(editurl => cgiurl(do => "edit", page => $page))
+             if IkiWiki->can("cgi_editpage");
          }
        }

done --Joey