Support » Plugin: Polylang » Issue with Polylang since 2.x (malformed wpml-config.xml files)

  • Plugin Author Chouby


    Since Polylang 2.0, a new xml parser (Simple XML) is used to read wpml-config.xml files. The reason for this move is the performance.

    The drawback (that I did not foresee before making the change as I never intentionally tested malformed wpml-config.xml files) is that this parser has no tolerance to XML syntax errors, while the old one was very tolerant. Some malformed wpml-config.xml files are readable in WPML or Polylang < 2.0 and are no more readable in Polylang 2.0+.

    The consequence for the users are:
    * Strings don’t appear in strings translations admin panel.
    * Custom post types / custom taxonomies not correctly managed.
    * Custom fields are not synchronized across posts.

    One error breaks the complete wpml-config.xml file (Polylang will still read other files which are correctly written).

    Users running their site in DEBUG mode will also see warnings starting with:

    PHP Warning:  simplexml_load_file()

    What to do if you suspect such error?

    You can check the syntax of a wpml-config.xml file in an online XML validator such as It will tell you where the error is. Then ask the author to fix the error.

    So far, I found such errors in:
    * Pinnacle (fixed in 1.4.4)
    * Virtue Premium (probably fixed in latest version, same author as Pinnacle)
    * Content Aware Sidebars (PR proposed to the author on Github).
    * WooCommerce Cash on Pickup (not maintained for 2 years)

    Errors are also suspected (I did not check myself) in:
    * Zerif Pro
    * WooCommerce Tab Manager

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