Cannot read property 'emit' of null

[MickaelNeves]

Jan 06 10:45:26Z project [error] uncaughtException: Cannot read property 'emit' of null { date: 'Thu Jan 06 2022 10:45:25 GMT+0000 (Coordinated Universal Time)', process: { pid: 1711, uid: 1000, gid: 1000, cwd: '/var/www/html/project', execPath: '/home/ubuntu/.nvm/versions/node/v14.16.1/bin/node', version: 'v14.16.1', argv: [ '/home/ubuntu/.nvm/versions/node/v14.16.1/bin/node', '/usr/local/lib/node_modules/pm2/lib/ProcessContainerFork.js' ], memoryUsage: { rss: 238145536, heapTotal: 151007232, heapUsed: 132067608, external: 20670274, arrayBuffers: 21276420 } }, os: { loadavg: [ 0.15, 0.13, 0.06 ], uptime: 91051388 }, trace: [ { column: 16, file: '/var/www/html/project/node_modules/winston-papertrail/lib/winston-papertrail.js', function: null, line: 426, method: null, native: false }, { column: 5, file: 'internal/streams/writable.js', function: 'afterWrite', line: 466, method: null, native: false }, { column: 7, file: 'internal/streams/writable.js', function: 'onwrite', line: 446, method: null, native: false }, { column: 12, file: 'internal/stream_base_commons.js', function: 'WriteWrap.onWriteComplete [as oncomplete]', line: 89, method: 'onWriteComplete [as oncomplete]', native: false } ], stack: [ "TypeError: Cannot read property 'emit' of null", ' at /var/www/html/project/node_modules/winston-papertrail/lib/winston-papertrail.js:426:16', ' at afterWrite (internal/streams/writable.js:466:5)', ' at onwrite (internal/streams/writable.js:446:7)', ' at WriteWrap.onWriteComplete [as oncomplete] (internal/stream_base_commons.js:89:12)' ] }

I'm getting tons of these errors in Papertrail, any thought on what this could be?