FIX: ensures we have a user

FIX: ensures we have a user

diff --git a/assets/javascripts/discourse/widgets/discourse-post-event-invitee.js.es6 b/assets/javascripts/discourse/widgets/discourse-post-event-invitee.js.es6
index fc1ffa9..7acff5e 100644
--- a/assets/javascripts/discourse/widgets/discourse-post-event-invitee.js.es6
+++ b/assets/javascripts/discourse/widgets/discourse-post-event-invitee.js.es6
@@ -16,6 +16,7 @@ export default createWidget("discourse-post-event-invitee", {
 
     if (
       this.currentUser &&
+      attrs.invitee.user &&
       this.currentUser.username === attrs.invitee.user.username
     ) {
       classes.push("is-current-user");

GitHub sha: 6c12b186