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Resolving Common TranslatePress PHP Warnings and Errors

31 threads Sep 9, 2025 Plugin → Translate multilingual sites – translatepress

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Users of the 'Translate Multilingual sites – TranslatePress' plugin often encounter PHP warnings and errors in their server logs. These issues can range from minor notices that don't affect site functionality to fatal errors that cause a white screen of death. Based on community reports, this guide covers the most common errors and their solutions.

Common Errors and Their Solutions

1. "Attempt to read property 'post_content' on null"

Error Snippet: PHP Warning: Attempt to read property "post_content" on null in .../translatepress-multilingual/includes/compatibility-functions.php on line 2171

Why it happens: This warning occurs when the plugin tries to access a property of a post object that doesn't exist (is null). This is often triggered by custom queries or specific themes/plugins that modify post retrieval.

Solution: This is a known issue acknowledged by the TranslatePress development team. A fix is expected in a future plugin update. Until then, the warning is typically non-critical and can often be ignored if it's not causing visible site issues.

2. "_load_textdomain_just_in_time was called incorrectly" (WordPress 6.7+)

Error Snippet: PHP Notice: Function _load_textdomain_just_in_time was called incorrectly. Translation loading for the translatepress-multilingual domain was triggered too early...

Why it happens: Starting with WordPress 6.7, translation files must be loaded later in the WordPress lifecycle (on the 'init' action or later). This notice appears when a plugin loads them too early.

Solution: The TranslatePress team is aware of this compatibility issue with WordPress 6.7 and is working on a fix. While you wait for an update, you can often safely ignore this notice as it typically does not break site functionality.

3. "__clone method called on non-object" Fatal Error

Error Snippet: PHP Fatal error: Uncaught Error: __clone method called on non-object in .../translatepress-multilingual/includes/class-url-converter.php:428

Why it happens: This fatal error, which crashes the site, is often related to object caching. It can be triggered when adding a second language if a specific caching configuration is active.

Solution: A common workaround is to check your caching setup. If you are using an object cache like the SQLite Object Cache, try disabling it. You can also check if the WP_CACHE constant is set to false and TRP_DEBUG is set to true; if so, try setting WP_CACHE to true and TRP_DEBUG to false to prevent the error.

4. "Call to undefined method WP_Translations::translate_entry()"

Error Snippet: PHP Fatal error: Uncaught Error: Call to undefined method WP_Translations::translate_entry()...

Why it happens: This error suggests a conflict or compatibility issue with how the plugin interacts with WordPress's translation functions, possibly related to other plugins or themes.

Solution: Perform a conflict test. Deactivate all other plugins and switch to a default WordPress theme (like Twenty Twenty-One). If the error disappears, reactivate your plugins and theme one by one to identify the conflicting software.

5. "Undefined array key 'translateable_content'" and Array Warnings

Error Snippet: PHP Warning: Undefined array key "translateable_content"... Trying to access array offset on value of type null...

Why it happens: These warnings indicate the code is trying to access an array element that does not exist or is trying to use an array function on a variable that is null.

Solution: In some cases, upgrading your PHP version (e.g., from 7.x to 8.x) has been reported to resolve these types of warnings. Ensure you are using a PHP version that is fully compatible with your WordPress installation.

General Troubleshooting Steps

For any persistent error, follow these general steps:

  1. Update Everything: Ensure WordPress, TranslatePress, your theme, and all other plugins are updated to their latest versions.
  2. Conflict Test: As mentioned in error #4, the most reliable way to identify a conflict is to test with all other plugins disabled and a default theme active.
  3. Check PHP Version: Run a recent, supported version of PHP (e.g., 8.1, 8.2, or 8.3). Some errors are resolved by simply updating PHP.
  4. Wait for an Update: For known bugs, the most effective solution is often to wait for the TranslatePress development team to release a patch. Monitor the official plugin page for update notifications.

Remember, warnings and notices can often be present without affecting your site's front-end performance. Fatal errors, however, require immediate attention. Always test changes on a staging site before applying them to your live website.

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