### ⚠️ This issue respects the following points: ⚠️
- [X] This is a **bug**, no…t a question or a configuration/webserver/proxy issue.
- [X] This issue is **not** already reported on Github _(I've searched it)_.
- [X] Nextcloud Server **is** up to date. See [Maintenance and Release Schedule](https://github.com/nextcloud/server/wiki/Maintenance-and-Release-Schedule) for supported versions.
- [X] I agree to follow Nextcloud's [Code of Conduct](https://nextcloud.com/contribute/code-of-conduct/).
### Bug description
Error: Undefined array key "size" at /var/www/nextcloud/apps/files_external/lib/Lib/Storage/SFTP.php#460
### Steps to reproduce
1.Added SFTP External Site
2.
3.
### Expected behavior
NA
### Installation method
Manual installation
### Operating system
Debian/Ubuntu
### PHP engine version
PHP 8.0
### Web server
Apache (supported)
### Database engine version
MariaDB
### Is this bug present after an update or on a fresh install?
Fresh Nextcloud Server install
### Are you using the Nextcloud Server Encryption module?
Encryption is Disabled
### What user-backends are you using?
- [X] Default user-backend _(database)_
- [X] LDAP/ Active Directory
- [ ] SSO - SAML
- [ ] Other
### Configuration report
```shell
{
"system": {
"instanceid": "***REMOVED SENSITIVE VALUE***",
"passwordsalt": "***REMOVED SENSITIVE VALUE***",
"secret": "***REMOVED SENSITIVE VALUE***",
"trusted_domains": [
"cloud.next.org"
],
"datadirectory": "***REMOVED SENSITIVE VALUE***",
"dbtype": "mysql",
"version": "23.0.3.2",
"overwrite.cli.url": "https:\/\/cloud.next.org",
"htaccess.RewriteBase": "\/",
"dbname": "***REMOVED SENSITIVE VALUE***",
"dbhost": "***REMOVED SENSITIVE VALUE***",
"dbport": "",
"dbtableprefix": "oc_",
"mysql.utf8mb4": true,
"dbuser": "***REMOVED SENSITIVE VALUE***",
"dbpassword": "***REMOVED SENSITIVE VALUE***",
"installed": true,
"memcache.local": "\\OC\\Memcache\\APCu",
"memcache.distributed": "\\OC\\Memcache\\Redis",
"memcache.locking": "\\OC\\Memcache\\Redis",
"redis": {
"host": "***REMOVED SENSITIVE VALUE***",
"port": 6379
},
"default_phone_region": "US",
"mail_from_address": "***REMOVED SENSITIVE VALUE***",
"mail_smtpmode": "smtp",
"mail_sendmailmode": "smtp",
"mail_domain": "***REMOVED SENSITIVE VALUE***",
"mail_smtphost": "***REMOVED SENSITIVE VALUE***",
"mail_smtpport": "25",
"skeletondirectory": "\/var\/skeleton",
"simpleSignUpLink.shown": false,
"trashbin_retention_obligation": "auto,30",
"versions_retention_obligation": "auto,1",
"allow_local_remote_servers": true,
"preview_max_memory": 1280,
"ldapProviderFactory": "OCA\\User_LDAP\\LDAPProviderFactory",
"twofactor_enforced": "true",
"twofactor_enforced_groups": [],
"twofactor_enforced_excluded_groups": []
}
}
```
### List of activated Apps
```shell
- accessibility: 1.9.0
- activity: 2.15.0
- admin_audit: 1.13.0
- bruteforcesettings: 2.3.0
- circles: 23.1.0
- cloud_federation_api: 1.6.0
- comments: 1.13.0
- contactsinteraction: 1.4.0
- dashboard: 7.3.0
- dav: 1.21.0
- federatedfilesharing: 1.13.0
- federation: 1.13.0
- files: 1.18.0
- files_external: 1.15.0
- files_pdfviewer: 2.4.0
- files_rightclick: 1.2.0
- files_sharing: 1.15.0
- files_trashbin: 1.13.0
- files_versions: 1.16.0
- files_videoplayer: 1.12.0
- firstrunwizard: 2.12.0
- groupfolders: 11.1.2
- impersonate: 1.10.0
- logreader: 2.8.0
- lookup_server_connector: 1.11.0
- nextcloud_announcements: 1.12.0
- notifications: 2.11.1
- oauth2: 1.11.0
- officeonline: 1.1.3
- password_policy: 1.13.0
- photos: 1.5.0
- privacy: 1.7.0
- provisioning_api: 1.13.0
- recommendations: 1.2.0
- serverinfo: 1.13.0
- settings: 1.5.0
- sharebymail: 1.13.0
- spreed: 13.0.4
- support: 1.6.0
- survey_client: 1.11.0
- suspicious_login: 4.1.0
- systemtags: 1.13.0
- text: 3.4.1
- theming: 1.14.0
- twofactor_admin: 3.2.0
- twofactor_backupcodes: 1.12.0
- twofactor_email: 2.1.1
- twofactor_totp: 6.2.0
- updatenotification: 1.13.0
- user_ldap: 1.13.1
- user_status: 1.3.1
- viewer: 1.7.0
- weather_status: 1.3.0
- workflowengine: 2.5.0
Disabled:
- encryption
```
### Nextcloud Signing status
_No response_
### Nextcloud Logs
```shell
{"reqId":"BMhVIkiOx1MPhIESPwYr","level":3,"time":"2022-04-06T14:47:46+00:00","remoteAddr":"10.0.10.99","user":"ax","app":"PHP","method":"GET","url":"/index.php/apps/files/ajax/download.php?dir=%2FAviat%20FTP%2FProVision&files=GA_releases&downloadStartSecret=f5h567ouluu","message":"Undefined array key \"size\" at /var/www/nextcloud/apps/files_external/lib/Lib/Storage/SFTP.php#460","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.84 Safari/537.36","version":"23.0.3.2","exception":{"Exception":"Error","Message":"Undefined array key \"size\" at /var/www/nextcloud/apps/files_external/lib/Lib/Storage/SFTP.php#460","Code":0,"Trace":[{"file":"/var/www/nextcloud/apps/files_external/lib/Lib/Storage/SFTP.php","line":460,"function":"onError","class":"OC\\Log\\ErrorHandler","type":"::"},{"file":"/var/www/nextcloud/lib/private/Files/Storage/Common.php","line":187,"function":"stat","class":"OCA\\Files_External\\Lib\\Storage\\SFTP","type":"->"},{"file":"/var/www/nextcloud/lib/private/Files/Storage/Common.php","line":331,"function":"filemtime","class":"OC\\Files\\Storage\\Common","type":"->"},{"file":"/var/www/nextcloud/lib/private/Files/Storage/Wrapper/Wrapper.php","line":381,"function":"hasUpdated","class":"OC\\Files\\Storage\\Common","type":"->"},{"file":"/var/www/nextcloud/lib/private/Files/Storage/Wrapper/Wrapper.php","line":381,"function":"hasUpdated","class":"OC\\Files\\Storage\\Wrapper\\Wrapper","type":"->"},{"file":"/var/www/nextcloud/lib/private/Files/Storage/Wrapper/Availability.php","line":386,"function":"hasUpdated","class":"OC\\Files\\Storage\\Wrapper\\Wrapper","type":"->"},{"file":"/var/www/nextcloud/lib/private/Files/Storage/Wrapper/Wrapper.php","line":381,"function":"hasUpdated","class":"OC\\Files\\Storage\\Wrapper\\Availability","type":"->"},{"file":"/var/www/nextcloud/lib/private/Files/Cache/Watcher.php","line":134,"function":"hasUpdated","class":"OC\\Files\\Storage\\Wrapper\\Wrapper","type":"->"},{"file":"/var/www/nextcloud/lib/private/Files/View.php","line":1351,"function":"needsUpdate","class":"OC\\Files\\Cache\\Watcher","type":"->"},{"file":"/var/www/nextcloud/lib/private/Files/View.php","line":1454,"function":"getCacheEntry","class":"OC\\Files\\View","type":"->"},{"file":"/var/www/nextcloud/lib/private/legacy/OC_Files.php","line":373,"function":"getDirectoryContent","class":"OC\\Files\\View","type":"->"},{"file":"/var/www/nextcloud/lib/private/legacy/OC_Files.php","line":161,"function":"getNumberOfFiles","class":"OC_Files","type":"::"},{"file":"/var/www/nextcloud/apps/files/ajax/download.php","line":77,"function":"get","class":"OC_Files","type":"::"},{"file":"/var/www/nextcloud/lib/private/Route/Route.php","line":155,"args":["/var/www/nextcloud/apps/files/ajax/download.php"],"function":"require_once"},{"function":"OC\\Route\\{closure}","class":"OC\\Route\\Route","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/nextcloud/lib/private/Route/Router.php","line":310,"function":"call_user_func"},{"file":"/var/www/nextcloud/lib/base.php","line":1006,"function":"match","class":"OC\\Route\\Router","type":"->"},{"file":"/var/www/nextcloud/index.php","line":36,"function":"handleRequest","class":"OC","type":"::"}],"File":"/var/www/nextcloud/lib/private/Log/ErrorHandler.php","Line":92,"CustomMessage":"--"},"id":"624da87e5ee0d"}
```
### Additional info
_No response_