fetch.on("message") event is firing twice, though imap.search result is only one result

I am trying to fetch all unseen messages, but some times mail event is triggering twice

var self = this, search = self.options.search || [[ 'UNSEEN', ['SINCE', 'May 20, 2010'] ]];
    self.dbg('scanning %s with filter `%s`.', self.options.box,  search);
    self.imap.search(search, function (err, seachResults) {
        if (err) {
            self.emit('error', err);
            callback();
            return;
        }
        if (!seachResults || seachResults.length === 0) {
            self.dbg('no new mail in %s', self.options.box);
            callback();
            return;
        }
        self.dbg('found %d new messages', seachResults.length);
        var fetch = self.imap.fetch(seachResults, {
            markSeen: self.options.markSeen !== false,
            bodies: ''
        });
//this below event emitting twice
        fetch.on('message' function (msg,seqno) {
            var uid, flags;
            msg.on('attributes', function(attrs) {                                                           
                uid = attrs.uid;
                flags = attrs.flags;
                **self.dbg("Message uid", attrs.uid);                                                               
            }); 
            var mp = new MailParser();
            mp.once('end', function (mail) {
                mail.uid = uid;
                mail.flags = flags;
                if(uid>last_seq)
                self.emit('mail', mail);
                self.dbg('found mail '+mail.headers["message-id"]);
            });
            msg.once('body', function (stream, info) {
                stream.pipe(mp);
            });
        });
        fetch.once('end', function () {
            self.dbg('Done fetching all messages!');
            callback();
        });
```   The logs are showing mail id/uid printed twice but scanned only once and scan result was 1 item
This is not always happening, any solution so that fetch.on message only triggered once for once search result

[mscdex]

As far as the search criteria goes, I think there is an extra set of brackets that need to be removed, it should be just [ 'UNSEEN', ['SINCE', formattedDate] ] that is passed to search().

[mscdex]

As far as the error goes, that’s coming from mailparser, not imap, so you’d want to submit an issue with that project instead.