Trace: Error: Error: Callback was already called.
at process.on (/var/www/monitor/bin/cachet-monitor/node_modules/libnmap/lib/libnmap.js:116:17)
at process.emit (events.js:198:13)
at process._fatalException (internal/bootstrap/node.js:497:27)
at process.on (/var/www/monitor/bin/cachet-monitor/node_modules/libnmap/lib/libnmap.js:116:11)
at process.emit (events.js:198:13)
at process._fatalException (internal/bootstrap/node.js:497:27)