diff --git a/element_test.go b/element_test.go
index 49f55c3..65a269b 100644
--- a/element_test.go
+++ b/element_test.go
@@ -79,8 +79,6 @@ func TestElement_Tag(t *testing.T) {
 	is.True(!e.HasTag(Tag("zomg")))
 	e.Tag(Tag("zomg"))
 	is.True(e.HasTag(Tag("zomg")))
-	rq.mu.RLock()
-	defer rq.mu.RUnlock()
 	s := e.String()
 	if !strings.Contains(s, "zomg") {
 		t.Error(s)
diff --git a/request.go b/request.go
index 6701f62..506711b 100644
--- a/request.go
+++ b/request.go
@@ -120,19 +120,28 @@ func (rq *Request) clearLocked() *Request {
 	return rq
 }
 
+func (rq *Request) renderDebug(elem *Element, w io.Writer) {
+	var sb strings.Builder
+	_, _ = fmt.Fprintf(&sb, "<!-- id=%q %T tags=[", elem.Jid(), elem.Ui())
+	if rq.mu.TryRLock() {
+		defer rq.mu.RUnlock()
+		for i, tag := range rq.tagsOfLocked(elem) {
+			if i > 0 {
+				sb.WriteString(", ")
+			}
+			sb.WriteString(TagString(tag))
+		}
+	} else {
+		sb.WriteString("n/a")
+	}
+	sb.WriteByte(']')
+	_, _ = w.Write([]byte(strings.ReplaceAll(sb.String(), "-->", "==>") + " -->"))
+}
+
 func (rq *Request) render(elem *Element, w io.Writer, params []any) (err error) {
 	if err = elem.Ui().JawsRender(elem, w, params); err == nil {
 		if rq.Jaws.Debug {
-			var sb strings.Builder
-			_, _ = fmt.Fprintf(&sb, "<!-- id=%q %T tags=[", elem.Jid(), elem.Ui())
-			for i, tag := range elem.Request.TagsOf(elem) {
-				if i > 0 {
-					sb.WriteString(", ")
-				}
-				sb.WriteString(TagString(tag))
-			}
-			sb.WriteByte(']')
-			_, _ = w.Write([]byte(strings.ReplaceAll(sb.String(), "-->", "==>") + " -->"))
+			rq.renderDebug(elem, w)
 		}
 	}
 	return
@@ -265,23 +274,27 @@ func (rq *Request) Redirect(url string) {
 	})
 }
 
-func (rq *Request) TagsOf(elem *Element) (tags []any) {
-	if elem != nil {
-		if rq.mu.TryRLock() {
-			defer rq.mu.RUnlock()
-		}
-		for tag, elems := range rq.tagMap {
-			for _, e := range elems {
-				if e == elem {
-					tags = append(tags, tag)
-					break
-				}
+func (rq *Request) tagsOfLocked(elem *Element) (tags []any) {
+	for tag, elems := range rq.tagMap {
+		for _, e := range elems {
+			if e == elem {
+				tags = append(tags, tag)
+				break
 			}
 		}
 	}
 	return
 }
 
+func (rq *Request) TagsOf(elem *Element) (tags []any) {
+	if elem != nil {
+		rq.mu.RLock()
+		defer rq.mu.RUnlock()
+		tags = rq.tagsOfLocked(elem)
+	}
+	return
+}
+
 // Register creates a new Element with the given tagitem as a valid target
 // for dynamic updates.
 //
diff --git a/request_test.go b/request_test.go
index 9074ba9..8709cf8 100644
--- a/request_test.go
+++ b/request_test.go
@@ -516,7 +516,6 @@ func TestRequest_DeleteByTag(t *testing.T) {
 			t.Errorf("%q", s)
 		}
 	}
-
 }
 
 func TestRequest_HtmlIdBroadcast(t *testing.T) {
@@ -703,3 +702,31 @@ func TestRequest_CustomErrors(t *testing.T) {
 	var target2 errPendingCancelled
 	th.Equal(errors.As(cause, &target2), false)
 }
+
+func TestRequest_renderDebugLocked(t *testing.T) {
+	is := newTestHelper(t)
+	jw := New()
+	defer jw.Close()
+	rq := jw.NewRequest(nil)
+	defer jw.recycle(rq)
+
+	tss := &testUi{}
+	e := rq.NewElement(tss)
+	e.Tag(Tag("zomg"))
+
+	var sb strings.Builder
+	rq.renderDebug(e, &sb)
+
+	txt := sb.String()
+	is.Equal(strings.Contains(txt, "zomg"), true)
+	is.Equal(strings.Contains(txt, "n/a"), false)
+
+	rq.mu.Lock()
+	defer rq.mu.Unlock()
+	sb.Reset()
+	rq.renderDebug(e, &sb)
+
+	txt = sb.String()
+	is.Equal(strings.Contains(txt, "zomg"), false)
+	is.Equal(strings.Contains(txt, "n/a"), true)
+}