Class ‘PLL_Links_’ not found in /wp-content/plugins/polylang/include/model.php on line 915

4 comments

1. I had the same error, prior to the error was an “Undefined index” notice.
   It was caused by an empty $this->options['force_lang'] var.

   This var is loaded from the wp_options table, the option_name within this table is polylang. There should be a JSON encoded array of polylang options.

   In my case the issue could be fixed by removing the domains from the JSON data, so it reads something like:

   "domains";a:0:{}
   

2. This question can be still actual for some people.

   I’ve spent tons of hours on it. And the trick that helped me is to fall back to v.0.9.8 from here – https://wordpress.org/plugins/polylang/advanced/.

   Then get v.1.9.3 and unpack it to plugin folder. Then you are good to go with v.2+

3. I got here because Polylang 2.3.1 was throwing a similar error after a database migration:

   Class 'PLL_Links_' not found in /wp-content/plugins/polylang/include/model.php on line 560
   

   If you look at the code in the model.php file referenced in the error, you can see that the plugin tries to retrieve a class name using the ‘permalink_structure’ option set in the database. If the migration changes this option to something Polylang can’t handle, it triggers the error.

   To go around the fatal error, you either have to:

   • (re)move or rename the Polylang plugin folder, so that it does not trigger the error
   • Set the Permalinks setting to default in WordPress Admin via Options > Permalinks
   • reinstall Polylang (or remove/rename it) and reactivate it in the Plugins overview.

   or

   • manually delete the value for ‘permalink_structure’ in the wp_options table.

   WordPress should run normally after this. I have not yet found out why it cannot handle certain permalink settings, but if I do, I’ll update this answer.

4. I did a global domain replacement in the file when moving the database from local to live . The problem in the end was that the serialized array in wp_option.option_name = “polylang” is broken. You must change strings length in the domain array:

   wp_option.option_name = ...."domains";a:1: 
   {s:2:"en";s:21:"http://example.local/";}....
   

   on a local:

   s:21:"http://example.local/";
   

   after replacing in file:

   s:21:"http://example.com/";
   

   must be:

   s:19:"http://example.com/";
   

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