converse.js: "policy-violation" stanza received from OpenFire when using Firefox

I’m initializing converse with:

 converse.initialize({
        authentication: 'login',
        keepalive: true,
        auto_login: true,
        hide_muc_server: true,
        auto_reconnect: true,
        allow_bookmarks: false,
        bosh_service_url: 'https://foo.com:7443/http-bind/',
        show_controlbox_by_default: false,
        allow_muc_invitations: false,
        credentials_url: '/chat/credentials/foo/1000',
        auto_join_rooms: [{jid: 'ccc@conference.foo.com, nick: 'name30'}]
    });

It works fine, except very often on page refresh, I’m getting:

ERROR: request id 10.1 error 0 happened  converse.js:48498:13
WARNING: request errored, status: 0, number of errors: 1  converse.js:48500:13
POST XHR https://foo.com:7443/http-bind/ [HTTP/1.1 404 Invalid SID value. 116ms]
ERROR: request id 2.1 error 404 happened  converse.js:48498:13
WARNING: request errored, status: 404, number of errors: 1  converse.js:48500:13
Error: A "url" property or function must be specified  converse.js:47707:11
ERROR: request id 11.1 error 404 happened  converse.js:48498:13
WARNING: request errored, status: 404, number of errors: 1  converse.js:48500:13
ERROR: request id 12.1 error 404 happened  converse.js:48498:13
WARNING: request errored, status: 404, number of errors: 2  converse.js:48500:13
ERROR: request id 23.1 error 404 happened  converse.js:48498:13
WARNING: request errored, status: 404, number of errors: 1

I had similar issue before https://github.com/jcbrand/converse.js/issues/865, and it seemed I resolved it with upgrade.

But once we installed it on producution, I started getting this errors.

Do you have any idea why this happens? Thanks.