RiseupVPN quietly crashes on Arch Linux

I installed this package: https://aur.archlinux.org/packages/riseup-vpn-git.

I start RiseupVPN, it starts in the inactive mode. Then I click "Turn on" and after a short pause, the icon disappears from the tray.

When I it from the command line and do the same actions, this is the output:

riseup-vpn 
qrc:/qml/main.qml:150:13: QML Connections: Implicitly defined onFoo properties in Connections are dep
recated. Use this syntax instead: function onFoo(<arguments>) { ... }
qrc:/qml/main.qml:19:5: QML Connections: Implicitly defined onFoo properties in Connections are depre
cated. Use this syntax instead: function onFoo(<arguments>) { ... }
qml: systray init completed
qml: show systray
qml: Platform: linux
qml: DEBUG: Pre-seeded providers:
qml: {
    "default": "riseup",
    "providers": [
        {
            "apiURL": "https://api.black.riseup.net/",
            "applicationName": "RiseupVPN",
            "askForDonations": "true",
            "auth": "anon",
            "authEmptyPass": "false",
            "binaryName": "riseup-vpn",
            "caCertString": "-----BEGIN CERTIFICATE----- *** -----END CERTIFICATE-----",
            "donateURL": "https://riseup.net/vpn/donate",
            "geolocationAPI": "https://api.black.riseup.net:9001/json",
            "helpURL": "https://riseup.net/support",
            "name": "Riseup",
            "providerURL": "riseup.net",
            "timeStamp": "2021-02-08 23:57:09",
            "tosURL": "https://riseup.net/tos"
        }
    ]
}

2021/03/11 00:20:37 Client expects anon auth
2021/03/11 00:20:43 Fetching certificate to /tmp/leap-602198962/openvpn.pem
2021/03/11 00:20:53 Post "https://api.black.riseup.net/3/cert": context deadline exceeded (Client.Tim
eout exceeded while awaiting headers)

I believe the problem is related to https://api.black.riseup.net/3/cert — when I tried to open it in the browser, it responded with NET::ERR_CERT_AUTHORITY_INVALID and these lines (and also a certificate section):

Subject: choroy.riseup.net
Issuer: Riseup Networks Root CA
Expires on: Nov 17, 2021
Current date: Mar 11, 2021

If this helps, I'm trying to access the service from Russia.