Bitwarden error: cannot read property importkey of null

THis is the log

/--------------------------------------------------------------------\
|                       Starting Bitwarden_RS                        |
|                           Version 1.9.0                            |
|--------------------------------------------------------------------|
| This is an *unofficial* Bitwarden implementation, DO NOT use the   |
| official channels to report bugs/features, regardless of client.   |
| Report URL: https://github.com/dani-garcia/bitwarden_rs/issues/new |
\--------------------------------------------------------------------/

[2019-05-09 09:32:00][launch][INFO] Configured for production.
[2019-05-09 09:32:00][launch_][INFO] address: 0.0.0.0
[2019-05-09 09:32:00][launch_][INFO] port: 7277
[2019-05-09 09:32:00][launch_][INFO] log: critical
[2019-05-09 09:32:00][launch_][INFO] workers: 2
[2019-05-09 09:32:00][launch_][INFO] secret key: provided
[2019-05-09 09:32:00][launch_][INFO] limits: forms = 32KiB, json* = 10MiB
[2019-05-09 09:32:00][launch_][INFO] keep-alive: 5s
[2019-05-09 09:32:00][launch_][INFO] tls: disabled
[2019-05-09 09:32:00][rocket::fairing::fairings][INFO] Fairings:
[2019-05-09 09:32:00][_][INFO] 1 response: Application Headers
[2019-05-09 09:32:00][launch][INFO] Rocket has launched from http://0.0.0.0:7277
[2019-05-09 09:32:11][rocket::rocket][INFO] GET / text/html:
[2019-05-09 09:32:11][_][INFO] Matched: GET / (web_index)
[2019-05-09 09:32:11][_][INFO] Outcome: Success
[2019-05-09 09:32:11][_][INFO] Response succeeded.
[2019-05-09 09:32:11][rocket::rocket][INFO] GET /app/main.5d89a1c78e2fbd6f2ec5.css text/css:
[2019-05-09 09:32:11][_][INFO] Matched: GET /<p..> [10] (web_files)
[2019-05-09 09:32:11][_][INFO] Outcome: Success
[2019-05-09 09:32:11][_][INFO] Response succeeded.
[2019-05-09 09:32:11][rocket::rocket][INFO] GET /locales/it/messages.json?cache=1dqoka:
[2019-05-09 09:32:11][_][INFO] Matched: GET /<p..> [10] (web_files)
[2019-05-09 09:32:11][_][INFO] Outcome: Success
[2019-05-09 09:32:11][_][INFO] Response succeeded.
[2019-05-09 09:32:12][rocket::rocket][INFO] GET /locales/en/messages.json?cache=1dqoka:
[2019-05-09 09:32:12][_][INFO] Matched: GET /<p..> [10] (web_files)
[2019-05-09 09:32:12][_][INFO] Outcome: Success
[2019-05-09 09:32:12][_][INFO] Response succeeded.
[2019-05-09 09:32:18][rocket::rocket][INFO] POST /api/accounts/prelogin application/json; charset=utf-8:
[2019-05-09 09:32:18][_][INFO] Matched: POST /api/accounts/prelogin (prelogin)
[2019-05-09 09:32:18][_][INFO] Outcome: Success
[2019-05-09 09:32:18][_][INFO] Response succeeded.

@Klagio Please read the documentation.