diff --git a/app/javascript/dashboard/routes/dashboard/conversation/ConversationParticipant.vue b/app/javascript/dashboard/routes/dashboard/conversation/ConversationParticipant.vue
index 6088acf1a..1e348b746 100644
--- a/app/javascript/dashboard/routes/dashboard/conversation/ConversationParticipant.vue
+++ b/app/javascript/dashboard/routes/dashboard/conversation/ConversationParticipant.vue
@@ -164,7 +164,7 @@ export default {
     conversationId() {
       this.fetchParticipants();
     },
-    watchersFromStore(participants) {
+    watchersFromStore(participants = []) {
       this.selectedWatchers = [...participants];
     },
   },