heroku[web.1]: Process exited with status 137 - node.js

Question

I uploaded telegram bot with webhook on Heroku but the app crashes.
I checked Heroku support but nothing helped, so I really do not know what might be the problem.
I set telegram webhook in the following way:
class Bot {
constructor(token) {
this.client = new TelegramBotClient(token,
{ webhook: { port: process.env.PORT || 5000 } }
);
this.client.setWebHook(`${config.heroku_app}/bot${token}`);
}
My Procfile:
web: node main.js
package.json contains
"scripts": {
"start": "node main.js"
}
There are no long running build processes happen during a deploy, so that also shouldn't be the cause.
Error logs:
2022-06-01T12:52:12.810740+00:00 heroku[web.1]: Error R10 (Boot timeout) -> Web process failed to bind to $PORT within 60 seconds of launch
2022-06-01T12:52:12.848491+00:00 heroku[web.1]: Stopping process with SIGKILL
2022-06-01T12:52:13.000433+00:00 heroku[web.1]: Process exited with status 137
2022-06-01T12:52:13.090750+00:00 heroku[web.1]: State changed from starting to crashed
2022-06-01T12:52:15.688412+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=POST path="/{token}" host=notification-tg-bot.herokuapp.com request_id=7859b4ef-2a3d-4e61-8d8d-60513252502c fwd="91.108.6.71" dyno= connect= service= status=503 bytes= protocol=https
2022-06-01T12:53:15.778224+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=POST path="/{token}" host=notification-tg-bot.herokuapp.com request_id=aa04c555-c4c6-42d8-b254-bc6588b533d2 fwd="91.108.6.71" dyno= connect= service= status=503 bytes= protocol=https