Malformed login response - when logging in

[researcher]

I login with this simple code:

await session.startWithCredentials({
    accountName: acc.accountName,
    password: acc.password,
    steamGuardCode: SteamTotp.getAuthCode(auths[acc.accountName])
});

But it throws an error saying: 

Malformed login response

 

It used to work perfectly for many weeks, but today I found out that it throws an error.

[Dr. McKay]

Update to 1.9.1