错误代码修正

src/server/models/sessions/sessions.js

@@ -308,7 +308,7 @@ class Sessions extends RedisModel {
        let participants_key = RedisModel.makeRedisKey(REDIS_KEYS.SessionParticipants, sessionId);
        let participants = new Participants();
        let offset = (page - 1 < 0 ? 0 : page - 1) * size;
        let offset = (page - 1 < 0 ? 0 : page - 1) * size+1;
        let count = 20;
        participants.existsParticipant(sessionId, user, function (err, res) {