[BUG] Gives me an error message shortly after upgrading

[urbanracer34]

Is there an existing issue for this?

• I have searched the existing issues

Current Behavior

Accessing the container's web interface gives me the following error message: TypeError: dokuwiki\Parsing\ModeRegistry::__construct(): Argument #1 ($syntax) must be of type string, null given, called in /app/www/public/inc/parserutils.php on line 239
An unforeseen error has occured. This is most likely a bug somewhere.

More info has been written to the DokuWiki error log.

Expected Behavior

Should pull up a page with my content

Steps To Reproduce

Upgrade to latest version of dokuwiki.

Go to access pages through bookmark.

Error occurs

Environment

- OS: unRAID 7.3.2
- How docker service was installed: built in

CPU architecture

x86-64

Docker creation

docker run
  -d
  --name='dokuwiki'
  --net='bridge'
  --pids-limit 2048
  -e TZ="America/Regina"
  -e HOST_OS="Unraid"
  -e HOST_HOSTNAME="GibsonMini"
  -e HOST_CONTAINERNAME="dokuwiki"
  -e 'PUID'='99'
  -e 'PGID'='100'
  -e 'UMASK'='022'
  -l net.unraid.docker.managed=dockerman
  -l net.unraid.docker.webui='http://[IP]:[PORT:80]'
  -l net.unraid.docker.icon='https://raw.githubusercontent.com/linuxserver/docker-templates/master/linuxserver.io/img/dokuwiki-logo.png'
  -p '8443:80/tcp'
  -p '9443:443/tcp'
  -v '/mnt/user/appdata/dokuwiki':'/config':'rw' 'lscr.io/linuxserver/dokuwiki' 
1e57302dfd26cb4d1b88d6dbb31d2c57b8916532c2b607368e9cd16a1121e7c3

The command finished successfully!

Container logs

root@GibsonMini:~# docker logs dokuwiki
[migrations] started
[migrations] 01-nginx-site-confs-default: skipped
[migrations] 02-default-location: skipped
[migrations] done
───────────────────────────────────────

      ██╗     ███████╗██╗ ██████╗
      ██║     ██╔════╝██║██╔═══██╗
      ██║     ███████╗██║██║   ██║
      ██║     ╚════██║██║██║   ██║
      ███████╗███████║██║╚██████╔╝
      ╚══════╝╚══════╝╚═╝ ╚═════╝

   Brought to you by linuxserver.io
───────────────────────────────────────

To support LSIO projects visit:
https://www.linuxserver.io/donate/

───────────────────────────────────────
GID/UID
───────────────────────────────────────

User UID:    99
User GID:    100
───────────────────────────────────────
Linuxserver.io version: 2026-07-14-ls313
Build-date: 2026-07-14T11:16:43+00:00
───────────────────────────────────────
    
using keys found in /config/keys
Go to http://IP-ADDRESS:PORT/install.php to configure your install then restart your container when finished to remove install.php
[custom-init] No custom files found, skipping...
[ls.io-init] done.
[migrations] started
[migrations] 01-nginx-site-confs-default: skipped
[migrations] 02-default-location: skipped
[migrations] done
usermod: no changes
───────────────────────────────────────

      ██╗     ███████╗██╗ ██████╗
      ██║     ██╔════╝██║██╔═══██╗
      ██║     ███████╗██║██║   ██║
      ██║     ╚════██║██║██║   ██║
      ███████╗███████║██║╚██████╔╝
      ╚══════╝╚══════╝╚═╝ ╚═════╝

   Brought to you by linuxserver.io
───────────────────────────────────────

To support LSIO projects visit:
https://www.linuxserver.io/donate/

───────────────────────────────────────
GID/UID
───────────────────────────────────────

User UID:    99
User GID:    100
───────────────────────────────────────
Linuxserver.io version: 2026-07-14-ls313
Build-date: 2026-07-14T11:16:43+00:00
───────────────────────────────────────
    
using keys found in /config/keys
Existing install found, deleting install.php.
[custom-init] No custom files found, skipping...
[ls.io-init] done.
root@GibsonMini:~#

[github-actions]

Thanks for opening your first issue here! Be sure to follow the relevant issue templates, or risk having this issue marked as invalid.

[redge76]

Copy the file https://github.com/dokuwiki/dokuwiki/blob/6d10fb865f5e25ac6523d2bf15c2cb9763853197/conf/dokuwiki.php to your config directory.
This image should not mount the whole /config directory.

[urbanracer34]

I think I'm just going to nuke this from orbit and reinstall dokuwiki.

[urbanracer34]

That didn't work. same problem as before. :(

[urbanracer34]

Do I have to copy that file into the directory in order to resolve this?

[urbanracer34]

OMG. I JUST transferred the file over and all my data is back! Thank you so much! Do you require any more info from me?

[greigm]

For anyone finding this bug and wanting a more targeted approach to solving the issue, it was created (in my case, at least) by $conf['syntax'] suddenly being a required configuration setting. I simply added $conf['syntax'] = 'dw'; to my local.php config overrides, and restarted my container. All was well. Hope that helps someone.

[ezgoodnight]

For me, also using Unraid, the structure was appdata/dokuwiki/dokuwiki/conf/ and there is where I put the downloaded dokuwiki.php from the fix that redge76 commented here.

[splitbrain]

TBH this issue should not have been closed. It's clearly an issue in how the linuxserver image works - it does not update DokuWiki's default files when updating the image and people will run into this problem again in the future.

I recommend using the official image at https://github.com/dokuwiki/docker instead