diff --git a/libtextsecure/sendmessage.js b/libtextsecure/sendmessage.js
index e42fe21e1..ab070ff55 100644
--- a/libtextsecure/sendmessage.js
+++ b/libtextsecure/sendmessage.js
@@ -108,7 +108,7 @@ Message.prototype = {
         const item = new textsecure.protobuf.DataMessage.Preview();
         item.title = preview.title;
         item.url = preview.url;
-        item.image = preview.image;
+        item.image = preview.image || null;
         return item;
       });
     }