diff --git a/assets/js/webmention-utils.mjs b/assets/js/webmention-utils.mjs
index 6e72a8b..81e139c 100644
--- a/assets/js/webmention-utils.mjs
+++ b/assets/js/webmention-utils.mjs
@@ -62,8 +62,13 @@ function createRepliesBlock(replies, heading) {
     ).toLocaleDateString()}</a><div class="clear-both"></div>`;
     const card = document.createElement("div");
     card.className = "reply-card";
-    const sanitizer = new Sanitizer();
-    card.setHTML(reply.content.html, { sanitizer });
+    if (typeof Sanitizer !== "undefined") {
+      const sanitizer = new Sanitizer();
+      card.setHTML(reply.content.html, { sanitizer });
+    } else {
+      // todo sanitize manually
+      card.innerHTML = reply.content.html;
+    }
     card.insertBefore(author, card.firstChild);
     cell.appendChild(card);
     repliesTable.append(row);