diff --git a/builds/appchan-x.user.js b/builds/appchan-x.user.js
index b6d7eb662..83aabb236 100644
--- a/builds/appchan-x.user.js
+++ b/builds/appchan-x.user.js
@@ -6741,7 +6741,9 @@
       var err, key, link, options, service, title, titles, uid;
 
       key = data[0], uid = data[1], options = data[2], link = data[3];
-      service = Linkify.types[key].title;
+      if (!(service = Linkify.types[key].title)) {
+        return;
+      }
       titles = Conf['CachedTitles'];
       if (title = titles[uid]) {
         link.textContent = title[0];
diff --git a/builds/crx/script.js b/builds/crx/script.js
index 7a1a5e8aa..0814a0d56 100644
--- a/builds/crx/script.js
+++ b/builds/crx/script.js
@@ -6744,7 +6744,9 @@
       var err, key, link, options, service, title, titles, uid;
 
       key = data[0], uid = data[1], options = data[2], link = data[3];
-      service = Linkify.types[key].title;
+      if (!(service = Linkify.types[key].title)) {
+        return;
+      }
       titles = Conf['CachedTitles'];
       if (title = titles[uid]) {
         link.textContent = title[0];
diff --git a/src/Linkification/Linkify.coffee b/src/Linkification/Linkify.coffee
index 1829b30c5..4938a532c 100644
--- a/src/Linkification/Linkify.coffee
+++ b/src/Linkification/Linkify.coffee
@@ -152,7 +152,7 @@ Linkify =
 
   title: (data) ->
     [key, uid, options, link] = data
-    service = Linkify.types[key].title
+    return unless service = Linkify.types[key].title
     titles = Conf['CachedTitles']
     if title = titles[uid]
       link.textContent = title[0]