Queue.prototype.every is not working

[susemeee]

...node_modules\kue-scheduler\index.js:190
  var key = this.options.prefix + ':scheduler:' + uuid;
                        ^

TypeError: Cannot read property 'prefix' of undefined
    at Queue._getJobExpiryKey (...node_modules\kue-scheduler\index.js:190:25)
    at Queue.checkIfJobAlreadyScheduled (...node_modules\kue-scheduler\index.js:822:14)
    at nextTask (...node_modules\kue-scheduler\node_modules\async\dist\async.js:5297:14)
    at next (...node_modules\kue-scheduler\node_modules\async\dist\async.js:5304:9)
    at ...node_modules\kue-scheduler\node_modules\async\dist\async.js:906:16
    at Queue.prepareJobDefinition (...node_modules\kue-scheduler\index.js:816:7)
    at nextTask (...node_modules\kue-scheduler\node_modules\async\dist\async.js:5297:14)
    at next (...node_modules\kue-scheduler\node_modules\async\dist\async.js:5304:9)
    at ...node_modules\kue-scheduler\node_modules\async\dist\async.js:906:16
    at ensureJobInstance (...node_modules\kue-scheduler\index.js:797:9)
    at nextTask (...node_modules\kue-scheduler\node_modules\async\dist\async.js:5297:14)
    at next (...node_modules\kue-scheduler\node_modules\async\dist\async.js:5304:9)
    at ...node_modules\kue-scheduler\node_modules\async\dist\async.js:906:16
    at ensureInterval (...node_modules\kue-scheduler\index.js:789:9)
    at nextTask (...node_modules\kue-scheduler\node_modules\async\dist\async.js:5297:14)
    at Object.waterfall (...node_modules\kue-scheduler\node_modules\async\dist\async.js:5307:5)
    at Queue.every (...node_modules\kue-scheduler\index.js:783:9)
    ...

I'm currently using node 8.4.0 + Kue 0.11.6 + kue-scheduler 0.7.4