Using the phpdoc/phpdoc:latest Docker image, and only if I pass along an XML config file, I get the following error.
WITHOUT a config file, the documentation parsing works flawless.

Expected behavior

Speakable error message, or the documentation should get parsed…

Actual behavior

Using different XML configs (initially I had still an old one… but updated it & tried agatin), I always get the following error:

Attaching to phpdoc-1
phpdoc-1  | phpDocumentor 3.4.2-v3.5.3+10b8a76
phpdoc-1  | 
phpdoc-1  | 
phpdoc-1  | In Assert.php line 2074:
phpdoc-1  |                           
phpdoc-1  |   "" is not a valid path  
phpdoc-1  |                           
phpdoc-1  | 

Steps to reproduce the problem

1. Have a phpdoc XML-config file ready
2. Setup a docker-compose.yml & add a service for the image "phpdoc/phpdoc:latest"

phpdoc:
       image: phpdoc/phpdoc:latest
       platform: linux/x86_64
       restart: no
       volumes:
       command:

3. Bind the XML config file to the service using "volumes:"

volumes:
           - "./config.xml:/config.xml"
           - "./app-code:/data"
           - "./docs:/docs"

4. Set the "command:" to include an XML config file

command: -c /config.xml -d /data -t /docs

5. Run the docker-service: docker compose up -d phpdoc

Your environment

Docker, macOS

• Version used: phpDocumentor 3.4.2-v3.5.3+10b8a76
• Install method: Docker image
• Operating system and version (e.g. Ubuntu 20.04, Windows 10): macOS 15
• Link to your project: n/a
• Attach code that is involved