diff --git a/js/src/forum/components/PostPreview.js b/js/src/forum/components/PostPreview.js
index 14b51fccf..f13715dcc 100644
--- a/js/src/forum/components/PostPreview.js
+++ b/js/src/forum/components/PostPreview.js
@@ -16,7 +16,8 @@ export default class PostPreview extends Component {
   view() {
     const post = this.attrs.post;
     const user = post.user();
-    const excerpt = highlight(post.contentPlain(), this.attrs.highlight, 300);
+    const content = post.contentType() === 'comment' && post.contentPlain();
+    const excerpt = content ? highlight(content, this.attrs.highlight, 300) : '';
 
     return (
       <Link className="PostPreview" href={app.route.post(post)} onclick={this.attrs.onclick}>