Converting circular structure to JSON错误

在运行pomelo的时候，提示

 at Object.stringify (native)
    at util.js:41:30
    at String.replace (native)
    at Object.exports.format (util.js:35:23)
    at formatLogData (/home/game/GangCreed/game-server/node_modules/pomelo-logger/node_modules/log4js/lib/layouts.js:39:22)
    at colouredLayout (/home/game/GangCreed/game-server/node_modules/pomelo-logger/node_modules/log4js/lib/layouts.js:108:7)
    at Logger.<anonymous> (/home/game/GangCreed/game-server/node_modules/pomelo-logger/node_modules/log4js/lib/appenders/console.js:8:16)
    at Logger.emit (events.js:95:17)
    at Logger.log (/home/game/GangCreed/game-server/node_modules/pomelo-logger/node_modules/log4js/lib/logger.js:58:10)
    at Logger.(anonymous function) [as warn] (/home/game/GangCreed/game-server/node_modules/pomelo-logger/node_modules/log4js/lib/logger.js:77:30)

http://blog.csdn.net/wangchun8926/article/details/41531191

http://blog.csdn.net/huaye2007/article/details/9932705

http://stackoverflow.com/questions/21234436/uncaught-typeerror-converting-circular-structure-to-json

循环引用产生的问题，把对象里数据取出来给新的对象试试