diff --git a/lib/frenzy/task/fetch_favicon.ex b/lib/frenzy/task/fetch_favicon.ex
index 5c2b46c..1e4103d 100644
--- a/lib/frenzy/task/fetch_favicon.ex
+++ b/lib/frenzy/task/fetch_favicon.ex
@@ -25,7 +25,8 @@ defmodule Frenzy.Task.FetchFavicon do
       favicon_url =
         fetch_favicon_url_from_webpage(site_url) || URI.merge(site_url, "/favicon.ico")
 
-      with %Feed{favicon_url: old_url} when old_url != favicon_url <- feed,
+      with true <- is_binary(favicon_url),
+           %Feed{favicon_url: old_url} when old_url != favicon_url <- feed,
            {:ok, favicon_data} <- fetch_favicon_data(favicon_url) do
         changeset =
           Feed.changeset(feed, %{