diff --git a/backend/src/middleware/notifications/mentions/extractMentionedUsers.ts b/backend/src/middleware/notifications/mentions/extractMentionedUsers.ts
index e7e23ace7..ccee18af9 100644
--- a/backend/src/middleware/notifications/mentions/extractMentionedUsers.ts
+++ b/backend/src/middleware/notifications/mentions/extractMentionedUsers.ts
@@ -1,6 +1,6 @@
 import cheerio from 'cheerio'
 
-export default (content) => {
+export default (content?) => {
   if (!content) return []
   const $ = cheerio.load(content)
   const userIds = $('a.mention[data-mention-id]')