diff --git a/http-html.go b/http-html.go
index 0eec660..3ef7ea4 100644
--- a/http-html.go
+++ b/http-html.go
@@ -180,6 +180,10 @@ func (r *HTWriter) WriteTo(w io.Writer) (int64, error) {
 				Host:   "unknown.txt",
 			}
 		}
+		subject := ""
+		if s := twt.Subject(); s != nil {
+			subject = s.Tag().Text()
+		}
 		i, err = fmt.Fprintf(w, `
 			<article>
 				<header class="u-author h-card">
@@ -214,8 +218,8 @@ func (r *HTWriter) WriteTo(w io.Writer) (int64, error) {
 		`, "/?uri="+twter.URI, twter.Avatar,
 			"/?uri="+twter.URI, twter.Nick,
 			twter.URI, uri.Host,
-			"/conv/"+twt.Subject().Tag().Text(), fmt.Sprintf("<time datetime='%s'>%s</time>", twt.Created().Format(time.RFC3339), twt.Created().Format(time.RFC822)),
-			"/conv/"+twt.Subject().Tag().Text(), 
+			"/conv/"+subject, fmt.Sprintf("<time datetime='%s'>%s</time>", twt.Created().Format(time.RFC3339), twt.Created().Format(time.RFC822)),
+			"/conv/"+subject, 
 			twt,
 		)
 		output += int64(i)