<![CDATA[Forms produce repeated HTMLPurifier warnings]]>HTMLPurifier appears to be trying to write into a directory that isn't writable on Cloudron's read-only fs:

PHP Warning - Directory /app/code/vendor/ezyang/htmlpurifier/library/HTMLPurifier/DefinitionCache/Serializer not writable.  - in file /app/code/vendor/ezyang/htmlpurifier/library/HTMLPurifier/DefinitionCache/Serializer.php - at line 295 []

It's only a warning so I'm not sure it actually breaks anything, but this does not look like an upstream bug. Writing into that directory seems to be standard HTMLPurifier behavior and their documentation covers it. There's also a report of the same issue in another Cloudron app: https://forum.cloudron.io/topic/15476/repeated-htmlprurifier-warnings

Steps to reproduce:

  1. Install Mautic 7.1.2 (Package version 6.1.1)
  2. Log in
  3. Create a form
  4. In the "Fields" tab, add a new "Number" field, keeping default settings by immediately clicking "Add" in the modal
  5. Save the form
  6. Open the terminal for the Cloudron app
  7. Run cat /var/run/mautic/var/logs/mautic_prod-*.php

The error shows up in Mautic's error log a couple of times.

]]>https://forum.cloudron.io/topic/15590/forms-produce-repeated-htmlpurifier-warningsRSS for NodeThu, 04 Jun 2026 23:10:34 GMTThu, 04 Jun 2026 19:46:20 GMT60