Hi,
Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can. 
The Basics
- Nextcloud Server version (e.g., 29.x.x):
32.0.2
- Operating system and version (e.g., Ubuntu 24.04):
Debian 13 Trixie
- Web server and version (e.g, Apache 2.4.25):
Apache/2.4.65 (Debian)
- Reverse proxy and version _(e.g. nginx 1.27.2)
No reverse proxy
- PHP version (e.g, 8.3):
PHP 8.3.28 (cli) (built: Nov 20 2025 11:50:23) (NTS)
- Is this the first time you’ve seen this error? (Yes / No):
Yes
- When did this problem seem to first start?
every time I download multiple files at the same time and the Nextcloud ZIP function is used
- Installation method (e.g. AlO, NCP, Bare Metal/Archive, etc.)
Manual installation , No Docker , No AIO
- Are you using CloudfIare, mod_security, or similar? (Yes / No)
No
Summary of the issue you are facing:
If you select multiple files to download in the NC web interface and the ZIP function is used, errors will appear in the NC log.
Steps to replicate it (hint: details matter!):
- For example, select multiple images in the NC web interface
- Download the selected files
- Check the NC log; PHP errors appear after file downloads.
Log entries
Nextcloud
Please provide the log entries from your Nextcloud log that are generated during the time of problem (via the Copy raw option from Administration settings->Logging screen or from your nextcloud.log located in your data directory). Feel free to use a pastebin/gist service if necessary.
{"reqId":"gJva0q6uxP4ix7ATUmrJ","level":2,"time":"2025-11-22T02:56:51+00:00","remoteAddr":"192.168.1.254","user":"Boubou","app":"PHP","method":"HEAD","url":"/remote.php/dav/files/Boubou/Photo%20de%20Boubou/?accept=zip&files=%5B%22TikTok+Photos%2F20251121_204203.jpg%22%2C%22TikTok+Vid%C3%A9os%2F7c44e92c2e8862922770c1c181a6982c.mp4%22%2C%22TikTok+Vid%C3%A9os%2Fe36a8a2fa34551057f77f309149c02cc.mp4%22%2C%22TikTok+Vid%C3%A9os%2Fefc521b0ae935c915489316036e53bbd.mp4%22%5D","message":"Cannot modify header information - headers already sent by (output started at /var/www/nextcloud/3rdparty/deepdiver/zipstreamer/src/ZipStreamer.php:325) at /var/www/nextcloud/apps/epubviewer/vendor/sabre/http/lib/Sapi.php#64","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.36","version":"32.0.2.2","data":{"app":"PHP"}}
{"reqId":"gJva0q6uxP4ix7ATUmrJ","level":2,"time":"2025-11-22T02:56:51+00:00","remoteAddr":"192.168.1.254","user":"Boubou","app":"PHP","method":"HEAD","url":"/remote.php/dav/files/Boubou/Photo%20de%20Boubou/?accept=zip&files=%5B%22TikTok+Photos%2F20251121_204203.jpg%22%2C%22TikTok+Vid%C3%A9os%2F7c44e92c2e8862922770c1c181a6982c.mp4%22%2C%22TikTok+Vid%C3%A9os%2Fe36a8a2fa34551057f77f309149c02cc.mp4%22%2C%22TikTok+Vid%C3%A9os%2Fefc521b0ae935c915489316036e53bbd.mp4%22%5D","message":"Cannot modify header information - headers already sent by (output started at /var/www/nextcloud/3rdparty/deepdiver/zipstreamer/src/ZipStreamer.php:325) at /var/www/nextcloud/apps/epubviewer/vendor/sabre/http/lib/Sapi.php#68","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.36","version":"32.0.2.2","data":{"app":"PHP"}}
{"reqId":"gJva0q6uxP4ix7ATUmrJ","level":2,"time":"2025-11-22T02:56:51+00:00","remoteAddr":"192.168.1.254","user":"Boubou","app":"PHP","method":"HEAD","url":"/remote.php/dav/files/Boubou/Photo%20de%20Boubou/?accept=zip&files=%5B%22TikTok+Photos%2F20251121_204203.jpg%22%2C%22TikTok+Vid%C3%A9os%2F7c44e92c2e8862922770c1c181a6982c.mp4%22%2C%22TikTok+Vid%C3%A9os%2Fe36a8a2fa34551057f77f309149c02cc.mp4%22%2C%22TikTok+Vid%C3%A9os%2Fefc521b0ae935c915489316036e53bbd.mp4%22%5D","message":"Cannot modify header information - headers already sent by (output started at /var/www/nextcloud/3rdparty/deepdiver/zipstreamer/src/ZipStreamer.php:325) at /var/www/nextcloud/apps/epubviewer/vendor/sabre/http/lib/Sapi.php#68","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.36","version":"32.0.2.2","data":{"app":"PHP"}}
{"reqId":"gJva0q6uxP4ix7ATUmrJ","level":2,"time":"2025-11-22T02:56:51+00:00","remoteAddr":"192.168.1.254","user":"Boubou","app":"PHP","method":"HEAD","url":"/remote.php/dav/files/Boubou/Photo%20de%20Boubou/?accept=zip&files=%5B%22TikTok+Photos%2F20251121_204203.jpg%22%2C%22TikTok+Vid%C3%A9os%2F7c44e92c2e8862922770c1c181a6982c.mp4%22%2C%22TikTok+Vid%C3%A9os%2Fe36a8a2fa34551057f77f309149c02cc.mp4%22%2C%22TikTok+Vid%C3%A9os%2Fefc521b0ae935c915489316036e53bbd.mp4%22%5D","message":"Cannot modify header information - headers already sent by (output started at /var/www/nextcloud/3rdparty/deepdiver/zipstreamer/src/ZipStreamer.php:325) at /var/www/nextcloud/apps/epubviewer/vendor/sabre/http/lib/Sapi.php#70","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.36","version":"32.0.2.2","data":{"app":"PHP"}}
Web Browser
If the problem is related to the Web interface, open your browser inspector Console and Network tabs while refreshing (reloading) and reproducing the problem. Provide any relevant output/errors here that appear.
index.mjs:51 [WARN] files_sharing: OCA.Sharing.ExternalShareActions is deprecated, use `registerSidebarAction` from `@nextcloud/sharing` instead
Object
app
:
"files_sharing"
level
:
2
uid
:
"Boubou"
[[Prototype]]
:
Object
Web server / Reverse Proxy
The output of your apache2/system log in /var/log/apache2:
192.168.1.254 - - [22/Nov/2025:04:02:14 +0100] "HEAD /remote.php/dav/files/Boubou/Photo%20de%20Boubou/?accept=zip&files=%5B%22TikTok+Photos%2F20251121_204203.jpg%22%2C%22TikTok+Vid%C3%A9os%2F7c44e92c2e8862922770c1c181a6982c.mp4%22%2C%22TikTok+Vid%C3%A9os%2Fe36a8a2fa34551057f77f309149c02cc.mp4%22%5D HTTP/1.1" 200 733 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.36"
192.168.1.254 - - [22/Nov/2025:04:02:14 +0100] "GET /remote.php/dav/files/Boubou/Photo%20de%20Boubou/?accept=zip&files=%5B%22TikTok+Photos%2F20251121_204203.jpg%22%2C%22TikTok+Vid%C3%A9os%2F7c44e92c2e8862922770c1c181a6982c.mp4%22%2C%22TikTok+Vid%C3%A9os%2Fe36a8a2fa34551057f77f309149c02cc.mp4%22%5D HTTP/1.1" 200 19308156 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.36"
192.168.1.254 - - [22/Nov/2025:04:02:14 +0100] "GET /apps/logreader/api/poll?lastReqId=gJva0q6uxP4ix7ATUmrJ HTTP/1.1" 200 1425 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.36"
Configuration
Nextcloud
The output of occ config:list system or similar is best, but, if not possible, the contents of your config.php file from /path/to/nextcloud is fine (make sure to remove any identifiable information!):
"system": {
"instanceid": "***REMOVED SENSITIVE VALUE***",
"passwordsalt": "***REMOVED SENSITIVE VALUE***",
"secret": "***REMOVED SENSITIVE VALUE***",
"trusted_domains": [
"cloud.tiboxs.com",
"www.cloud.tiboxs.com",
"[2a01:e0a:831:XXXX:b696:XXXX:fe1f:XXXX]"
],
"trusted_proxies": "***REMOVED SENSITIVE VALUE***",
"datadirectory": "***REMOVED SENSITIVE VALUE***",
"dbtype": "mysql",
"version": "32.0.2.2",
"overwrite.cli.url": "https:\/\/cloud.tiboxs.com",
"dbname": "***REMOVED SENSITIVE VALUE***",
"dbhost": "***REMOVED SENSITIVE VALUE***",
"dbport": "",
"dbtableprefix": "oc_",
"mysql.utf8mb4": true,
"dbuser": "***REMOVED SENSITIVE VALUE***",
"dbpassword": "***REMOVED SENSITIVE VALUE***",
"installed": true,
"default_phone_region": "FR",
"htaccess.RewriteBase": "\/",
"trashbin_retention_obligation": "auto, 30",
"filelocking.enabled": "true",
"knowledgebaseenabled": false,
"activity_expire_days": 7,
"skeletondirectory": "\/var\/www\/extra_nextcloud\/skeleton\/",
"redis": {
"host": "***REMOVED SENSITIVE VALUE***",
"port": "0",
"timeout": "0.0"
},
"memcache.distributed": "\\OC\\Memcache\\Redis",
"memcache.local": "\\OC\\Memcache\\Redis",
"memcache.locking": "\\OC\\Memcache\\Redis",
"mail_smtpmode": "smtp",
"mail_sendmailmode": "smtp",
"mail_from_address": "***REMOVED SENSITIVE VALUE***",
"mail_domain": "***REMOVED SENSITIVE VALUE***",
"mail_smtphost": "***REMOVED SENSITIVE VALUE***",
"mail_smtpport": "465",
"mail_smtpauth": true,
"mail_smtpname": "***REMOVED SENSITIVE VALUE***",
"mail_smtppassword": "***REMOVED SENSITIVE VALUE***",
"default_language": "fr",
"default_locale": "fr_FR",
"updater.release.channel": "stable",
"maintenance_window_start": 1,
"maintenance": false,
"integrity.check.disabled": false,
"files.chunked_upload.max_size": 104857600,
"mail_smtpsecure": "ssl",
"twofactor_enforced": "false",
"enable_previews": true,
"enabledPreviewProviders": [
"OC\\Preview\\BMP",
"OC\\Preview\\GIF",
"OC\\Preview\\JPEG",
"OC\\Preview\\Krita",
"OC\\Preview\\MarkDown",
"OC\\Preview\\MP3",
"OC\\Preview\\OpenDocument",
"OC\\Preview\\PNG",
"OC\\Preview\\TXT",
"OC\\Preview\\XBitmap",
"OC\\Preview\\Image",
"OC\\Preview\\HEIC",
"OC\\Preview\\TIFF",
"OC\\Preview\\Movie",
"OC\\Preview\\MP4",
"OC\\Preview\\PDF"
],
"preview_max_x": 1024,
"preview_max_y": 1024,
"preview_concurrency_all": 16,
"preview_concurrency_new": 8,
"preview_max_filesize_image": 200,
"preview_max_memory": -1,
"preview_ffmpeg_path": "\/usr\/bin\/ffmpeg",
"theme": "",
"loglevel": 2,
"updatechecker": true,
"has_internet_connection": true,
"app_install_overwrite": {
"0": "otpmanager",
"1": "maps",
"3": "passman"
},
"updater.secret": "***REMOVED SENSITIVE VALUE***"
}
}
Apps
The output of occ app:list (if possible).
root@Nextcloud:~# sudo -u www-data php /var/www/nextcloud/occ app:list
Enabled:
- activity: 5.0.0-dev.0
- admin_audit: 1.22.0
- announcementcenter: 7.2.2
- bruteforcesettings: 5.0.0-dev.0
- calendar: 6.1.0
- cloud_federation_api: 1.16.0
- comments: 1.22.0
- contacts: 8.1.0
- contactsinteraction: 1.13.1
- dashboard: 7.12.0
- dav: 1.34.2
- drop_account: 2.8.0
- epubviewer: 1.8.1
- external: 7.0.0
- federatedfilesharing: 1.22.0
- files: 2.4.0
- files_accesscontrol: 3.0.2
- files_downloadlimit: 5.0.0-dev.0
- files_external: 1.24.0
- files_pdfviewer: 5.0.0-dev.0
- files_reminders: 1.5.0
- files_sharing: 1.24.1
- files_trashbin: 1.22.0
- files_versions: 1.25.0
- firstrunwizard: 5.0.0-dev.0
- guests: 4.6.0
- logreader: 5.0.0-dev.0
- lookup_server_connector: 1.20.0
- maps: 1.6.0
- metadata: 0.23.0
- nextcloud_announcements: 4.0.0-dev.0
- notes: 4.12.4
- notifications: 5.0.0-dev.0
- notify_push: 1.2.1
- oauth2: 1.20.0
- otpmanager: 0.5.4
- ownershiptransfer: 1.3.0
- passman: 2.4.12
- password_policy: 4.0.0-dev.0
- photos: 5.0.0-dev.1
- previewgenerator: 5.11.0
- profile: 1.1.0
- provisioning_api: 1.22.0
- quota_warning: 1.22.0
- registration: 2.8.0
- richdocuments: 9.0.1
- secrets: 2.1.4
- serverinfo: 4.0.0-dev.0
- settings: 1.15.1
- sharebymail: 1.22.0
- socialsharing_diaspora: 4.0.1
- socialsharing_email: 4.0.1
- socialsharing_facebook: 4.0.1
- socialsharing_twitter: 4.0.1
- spreed: 22.0.4
- suspicious_login: 10.0.0-dev.0
- tasks: 0.17.1
- terms_of_service: 4.7.0-rc.1
- text: 6.0.1
- theming: 2.7.0
- theming_customcss: 1.19.0
- twofactor_backupcodes: 1.21.0
- twofactor_email: 3.0.4-beta.1
- twofactor_nextcloud_notification: 6.0.0-dev.0
- twofactor_totp: 14.0.0
- unroundedcorners: 1.1.5
- updatenotification: 1.22.0
- user_retention: 1.15.0
- user_status: 1.12.0
- viewer: 5.0.0-dev.0
- weather_status: 1.12.0
- webhook_listeners: 1.3.0
- workflowengine: 2.14.0
Disabled:
- app_api: 32.0.0 (installed 5.0.2)
- circles: 32.0.0 (installed 27.0.1)
- encryption: 2.20.0 (installed 2.19.0)
- federation: 1.22.0 (installed 1.21.0)
- privacy: 4.0.0-dev.0 (installed 3.0.0)
- recommendations: 5.0.0-dev.0 (installed 1.6.0)
- related_resources: 3.0.0-dev.0 (installed 2.0.0)
- support: 4.0.0-dev.0 (installed 1.11.1)
- survey_client: 4.0.0-dev.0 (installed 4.0.0-dev.0)
- systemtags: 1.22.0 (installed 1.21.1)
- user_ldap: 1.23.0 (installed 1.19.0)
Tips for increasing the likelihood of a response
- Use the
preformatted textformatting option in the editor for all log entries and configuration output. - If screenshots are useful, feel free to include them.
- If possible, also include key error output in text form so it can be searched for.
- Try to edit log output only minimally (if at all) so that it can be ran through analyzers / formatters by those trying to help you.
