diff --git a/app/javascript/dashboard/store/modules/conversations/index.js b/app/javascript/dashboard/store/modules/conversations/index.js
index 94c125494..b3e39d397 100644
--- a/app/javascript/dashboard/store/modules/conversations/index.js
+++ b/app/javascript/dashboard/store/modules/conversations/index.js
@@ -146,7 +146,10 @@ export const mutations = {
 
   [types.ADD_CONVERSATION_ATTACHMENTS](_state, message) {
     // early return if the message has not been sent, or has no attachments
-    if (message.status !== MESSAGE_STATUS.SENT || !message.attachments.length) {
+    if (
+      message.status !== MESSAGE_STATUS.SENT ||
+      !message.attachments?.length
+    ) {
       return;
     }