diff --git a/server/queues/tasks/CommentUpdatedNotificationsTask.ts b/server/queues/tasks/CommentUpdatedNotificationsTask.ts
index 68fb184c6..91239c1b8 100644
--- a/server/queues/tasks/CommentUpdatedNotificationsTask.ts
+++ b/server/queues/tasks/CommentUpdatedNotificationsTask.ts
@@ -6,6 +6,11 @@ import BaseTask, { TaskPriority } from "./BaseTask";
 
 export default class CommentUpdatedNotificationsTask extends BaseTask<CommentEvent> {
   public async perform(event: CommentUpdateEvent) {
+    const newMentionIds = event.data.newMentionIds;
+    if (!newMentionIds) {
+      return;
+    }
+
     const [document, comment] = await Promise.all([
       Document.scope("withCollection").findOne({
         where: {
@@ -20,7 +25,7 @@ export default class CommentUpdatedNotificationsTask extends BaseTask<CommentEve
 
     const mentions = ProsemirrorHelper.parseMentions(
       ProsemirrorHelper.toProsemirror(comment.data)
-    ).filter((mention) => event.data.newMentionIds.includes(mention.id));
+    ).filter((mention) => newMentionIds.includes(mention.id));
     const userIdsMentioned: string[] = [];
 
     for (const mention of mentions) {
diff --git a/server/types.ts b/server/types.ts
index f661e6206..9b77db86e 100644
--- a/server/types.ts
+++ b/server/types.ts
@@ -342,7 +342,7 @@ export type CommentUpdateEvent = BaseEvent<Comment> & {
   documentId: string;
   actorId: string;
   data: {
-    newMentionIds: string[];
+    newMentionIds?: string[];
   };
 };