TypeError: Object true has no method 'map'
at async.waterfall.orphanCommands (/home/ubuntu/pool/lib/blockUnlocker.js:82:40)
at nextTask (/home/ubuntu/pool/node_modules/async/dist/async.js:5310:14)
at next (/home/ubuntu/pool/node_modules/async/dist/async.js:5317:9)
at /home/ubuntu/pool/node_modules/async/dist/async.js:958:16
at /home/ubuntu/pool/lib/blockUnlocker.js:75:17
at /home/ubuntu/pool/node_modules/async/dist/async.js:3358:25
at /home/ubuntu/pool/node_modules/async/dist/async.js:473:16
at iteratorCallback (/home/ubuntu/pool/node_modules/async/dist/async.js:1048:13)
at /home/ubuntu/pool/node_modules/async/dist/async.js:958:16
at /home/ubuntu/pool/node_modules/async/dist/async.js:3355:13
TypeError: Object true has no method 'map' at async.waterfall.orphanCommands (/home/ubuntu/pool/lib/blockUnlocker.js:82:40) at nextTask (/home/ubuntu/pool/node_modules/async/dist/async.js:5310:14) at next (/home/ubuntu/pool/node_modules/async/dist/async.js:5317:9) at /home/ubuntu/pool/node_modules/async/dist/async.js:958:16 at /home/ubuntu/pool/lib/blockUnlocker.js:75:17 at /home/ubuntu/pool/node_modules/async/dist/async.js:3358:25 at /home/ubuntu/pool/node_modules/async/dist/async.js:473:16 at iteratorCallback (/home/ubuntu/pool/node_modules/async/dist/async.js:1048:13) at /home/ubuntu/pool/node_modules/async/dist/async.js:958:16 at /home/ubuntu/pool/node_modules/async/dist/async.js:3355:13
What is causing this ?