Can't connect to Heroku "cannot read 'body' of undefined

[JorSoi]

Hey guys,

I'm quite new to Heroku and deploying a full stack app but I thought I would still inform about my issue.
When trying to connect to heroku I'm shown the following error message:

Cannot read property 'body' of undefined
TypeError: Cannot read property 'body' of undefined
at /Applications/Postbird.app/Contents/Resources/app.asar/app/login_components/heroku_client.js:150:18
at done (/Applications/Postbird.app/Contents/Resources/app.asar/node_modules/needle/lib/needle.js:442:14)
at ClientRequest.had_error (/Applications/Postbird.app/Contents/Resources/app.asar/node_modules/needle/lib/needle.js:452:5)
at ClientRequest.emit (events.js:200:13)
at TLSSocket.socketErrorListener (_http_client.js:402:9)
at TLSSocket.emit (events.js:200:13)
at emitErrorNT (internal/streams/destroy.js:91:8)
at emitErrorAndCloseNT (internal/streams/destroy.js:59:3)
at processTicksAndRejections (internal/process/task_queues.js:84:9)

Is this a postbird issue or did I just screw something up myself?
Cheers,
Jorim