callback is not a function

[joliny]

/root/nomp/libs/poolWorker.js:169
callback({
^

TypeError: callback is not a function
at /root/nomp/libs/poolWorker.js:169:17
at /root/nomp/libs/poolWorker.js:151:29
at /root/nomp/node_modules/stratum-pool/lib/daemon.js:177:17
at /root/nomp/node_modules/async/lib/async.js:52:16
at done (/root/nomp/node_modules/async/lib/async.js:246:17)
at /root/nomp/node_modules/async/lib/async.js:44:16
at itemFinished (/root/nomp/node_modules/stratum-pool/lib/daemon.js:157:17)
at /root/nomp/node_modules/stratum-pool/lib/daemon.js:171:17
at parseJson (/root/nomp/node_modules/stratum-pool/lib/daemon.js:85:17)
at IncomingMessage. (/root/nomp/node_modules/stratum-pool/lib/daemon.js:95:17)