diff --git a/index.ts b/index.ts
index 1b7444a..42a371f 100644
--- a/index.ts
+++ b/index.ts
@@ -259,6 +259,7 @@ app.action('check-synced', async (ctx) => {
 
         for (let fren of frens) {
             const dbFren = links.find(frend => frend.nsaid == fren.nsaId)!;
+            if (!dbFren) continue;
             const slackUser = (await app.client.users.info({ user: dbFren.slackid })).user!;
             
             if (slackUser.is_admin || slackUser.is_owner) return;