unable to validate session

[aqwzs]

how do I validate a session, I use qr-code login, it logs in perfectly but I'm unable to verify the session an thus am unable to get any other data
here's the error log:

(node:2476) UnhandledPromiseRejectionWarning: Error: Current Session is not valid
    at WebUntisQR._request (/home/pi/RMUntis4/node_modules/webuntis/index.js:548:71)
    at processTicksAndRejections (internal/process/task_queues.js:95:5)
    at async WebUntisQR.getOwnTimetableForToday (/home/pi/RMUntis4/node_modules/webuntis/index.js:252:16)
(Use `node --trace-warnings ...` to show where the warning was created)
(node:2476) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
(node:2476) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

[TheNoim]

Can you do some debugging? Does it fail here or here or here.

Sorry for the late response.