Can't create event on calendar : Event does not exist

[ghost]

Steps to reproduce

1. Go to Calendar
2. Click "New event"
3. Popup error

Expected behaviour

Excepted to able to create a new event.

Actual behaviour

Popup error

Server configuration

Operating system: Linux 4.19.107-Unraid #1 SMP Thu Mar 5 13:55:57 PST 2020 x86_64

Webserver: nginx/1.18.0 (fpm-fcgi)

Database: mysql 10.4.16

PHP version: 7.3.24

Modules loaded: Core, date, libxml, pcre, zlib, filter, hash, readline, Reflection, SPL, session, cgi-fcgi, bcmath, bz2, ctype, curl, dom, fileinfo, ftp, gd, gmp, iconv, intl, json, ldap, mbstring, openssl, pcntl, PDO, pgsql, posix, standard, SimpleXML, smbclient, sodium, sqlite3, xml, xmlwriter, zip, exif, imap, mysqlnd, pdo_pgsql, pdo_sqlite, Phar, xmlreader, pdo_mysql, apcu, igbinary, redis, memcached, imagick, mcrypt, libsmbclient, Zend OPcache

Nextcloud version: 20.0.1 - 20.0.1.1

Updated from an older Nextcloud/ownCloud or fresh install:

Where did you install Nextcloud from: unknown

Signing status

Array
(
)

List of activated apps

Enabled:
 - accessibility: 1.6.0
 - activity: 2.13.2
 - apporder: 0.11.0
 - bruteforcesettings: 2.0.1
 - calendar: 2.1.2
 - cloud_federation_api: 1.3.0
 - contactsinteraction: 1.1.0
 - cookbook: 0.7.6
 - dashboard: 7.0.0
 - dav: 1.16.0
 - deck: 1.1.2
 - federatedfilesharing: 1.10.1
 - federation: 1.10.1
 - files: 1.15.0
 - files_pdfviewer: 2.0.1
 - files_rightclick: 0.17.0
 - files_sharing: 1.12.0
 - files_trashbin: 1.10.1
 - files_versions: 1.13.0
 - files_videoplayer: 1.9.0
 - logreader: 2.5.0
 - lookup_server_connector: 1.8.0
 - nextcloud_announcements: 1.9.0
 - notes: 4.0.0
 - notifications: 2.8.0
 - oauth2: 1.8.0
 - password_policy: 1.10.1
 - photos: 1.2.0
 - privacy: 1.4.0
 - provisioning_api: 1.10.0
 - recommendations: 0.8.0
 - serverinfo: 1.10.0
 - settings: 1.2.0
 - sharebymail: 1.10.0
 - support: 1.3.0
 - survey_client: 1.8.0
 - tasks: 0.13.6
 - text: 3.1.0
 - theming: 1.11.0
 - twofactor_backupcodes: 1.9.0
 - updatenotification: 1.10.0
 - user_status: 1.0.0
 - viewer: 1.4.0
 - weather_status: 1.0.0
 - workflowengine: 2.2.0
Disabled:
 - admin_audit
 - comments
 - contacts
 - encryption
 - files_external
 - firstrunwizard
 - geoblocker
 - issuetemplate
 - ransomware_protection
 - systemtags
 - user_ldap
 - workflow_pdf_converter

Configuration (config/config.php)

{
    "memcache.local": "\\OC\\Memcache\\APCu",
    "datadirectory": "***REMOVED SENSITIVE VALUE***",
    "instanceid": "***REMOVED SENSITIVE VALUE***",
    "passwordsalt": "***REMOVED SENSITIVE VALUE***",
    "secret": "***REMOVED SENSITIVE VALUE***",
    "trusted_domains": [
        "192.168.1.9:30443",
        "10.253.0.1:30443"
    ],
    "dbtype": "mysql",
    "version": "20.0.1.1",
    "overwrite.cli.url": "https:\/\/192.168.1.9:30443",
    "dbname": "***REMOVED SENSITIVE VALUE***",
    "dbhost": "***REMOVED SENSITIVE VALUE***",
    "dbport": "",
    "dbtableprefix": "oc_",
    "mysql.utf8mb4": true,
    "dbuser": "***REMOVED SENSITIVE VALUE***",
    "dbpassword": "***REMOVED SENSITIVE VALUE***",
    "installed": true,
    "mail_from_address": "***REMOVED SENSITIVE VALUE***",
    "mail_smtpmode": "smtp",
    "mail_sendmailmode": "smtp",
    "mail_domain": "***REMOVED SENSITIVE VALUE***",
    "mail_smtpauthtype": "LOGIN",
    "mail_smtpsecure": "tls",
    "mail_smtpauth": 1,
    "mail_smtphost": "***REMOVED SENSITIVE VALUE***",
    "mail_smtpport": "587",
    "mail_smtpname": "***REMOVED SENSITIVE VALUE***",
    "mail_smtppassword": "***REMOVED SENSITIVE VALUE***",
    "maintenance": false,
    "updater.release.channel": "stable",
    "loglevel": 2,
    "theme": "",
    "app_install_overwrite": [
        "cookbook"
    ]
}

External storages: files_external is disabled

Encryption: no

User-backends:

• OC\User\Database

Browser: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:82.0) Gecko/20100101 Firefox/82.0

[ghost]

Created on the right repo : nextcloud/calendar#2694
Sorry.