node.js connect-redis redis.get(key,callback) return null

in connect-redis to return session value use .get(sid, callback) but it always return null so I think its not save in redis but I check it session save in redis correctly after investigation find problem is with Sid see /connect-redis/lib/connect-redis.js

  RedisStore.prototype.get = function(sid, fn){
   sid =this.prefix + sid;
    debug('GET "%s"', sid);

    console.log('lib');
    console.log(sid);

    this.client.get( sid , function(err, data){

      if (err) return fn(err);
      if (!data) return fn(null,'');
      var result;
      data = data.toString();
      debug('GOT %s', data);
      try {
        result = JSON.parse(data); 
      } catch (err) {
        return fn(err);
      }

      return fn(null, result);
    });
  };

if I but sessionID as string it will return session

  RedisStore.prototype.get = function(sid, fn){

  //  sid =this.prefix + sid;
    debug('GET "%s"', sid);

    console.log('lib');
    console.log(sid);

    this.client.get( 'lweUw//EdbygbGr/2gAZt0kb' , function(err, data){

      if (err) return fn(err);
      if (!data) return fn(null,'');
      var result;
      data = data.toString();
      debug('GOT %s', data);
      try {
        result = JSON.parse(data); 
      } catch (err) {
        return fn(err);
      }

      return fn(null, result);
    });
  };

Note:

typeof(sid) is string even if add qoute to sid like this "\'sid\'" it will return null