sync flags on server start

back/mails/message/updateMessage.ts

@@ -12,7 +12,8 @@ export default class updateMessage {
     }
 
     async updateFlags() {
-        const messageId = (await getMessageIdOnUid(this.uid))[0].message_id;
+        const messageId = (await getMessageIdOnUid(this.uid))[0]?.message_id;
+        if (!messageId) return;
         const currentFlags = await getFlags(this.uid);
 
         const flagsToAdd = this.flags.filter((flag) => !currentFlags.find((f) => flag == f.flag_name));