sulla: Sulla do not detect already authenticated and hang

Using the example script:

On first start or after deleting ‘session’ the example programm detects and show QR code. After scanning QR code sending and recieving new messages is working

node dealwaecho.js
✔ Initializing whatsapp
ℹ Authenticate to continue
▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄
█ ▄▄▄▄▄ █▄█▀▀▀█▀███▄█ ▄█  ▀ █▀▀ █ █ ▄▄▄▄▄ █
█ █   █ █ ▄█ ▄ ▄█▄█▄ ▀▀▀ █▄▀█ █▄█ █ █   █ █
█ █▄▄▄█ █▄ ███ ▀█ ▄█▀█ ████▄█▄ ▀▀██ █▄▄▄█ █
█▄▄▄▄▄▄▄█▄█▄█ █ ▀▄▀ █ █ █ █▄█▄▀▄█▄█▄▄▄▄▄▄▄█
█  ▄▄▀▀▄▀ ▀▄▄▀▀▄██ █▀▀▀▀ ▀▄▄ ▀▀  ▄▄▀█ ▄ ▀ █
...
██▄▄███▄▄▀▄█▀▄█▄▄ ▀ █▀ █▄█▄ ▀▀▀▄▄ ▄▄▄ █ ▀ █
█ ▄▄▄▄▄ ██▄▄  ▀ ▀██▀▀▄█▄ ▄▀█▀▀██▄ █▄█ ▄▄▄▀█
█ █   █ █▀▄▀▀ ▀█▀▀▀█▀▄▀▄▀ ▀▄▀ ▀▀▀  ▄▄▄███▄█
█ █▄▄▄█ █ ▄▀ █▄▀▀▀▄▀ █  ▀ ██▀█▄▀█ ██ █▄█▀██
█▄▄▄▄▄▄▄█▄█▄█▄██▄█▄▄▄██▄▄▄███▄█▄▄▄██▄█▄█▄██

✔ Authenticating
✔ Whatsapp is ready

On second start sulla hangs while detecing auth:

node dealwaecho.js
✔ Initializing whatsapp
ℹ Authenticate to continue

OS: Linux, OpenSuse 15.3 node: v10.16.3

Any Ideas whats going wrong?