Advanced Custom Fields - Fatal error on secondary-language options pages with taxonomy fields

Overview of the issue

When using Advanced Custom Fields with WPML, you might experience a fatal error when opening an options page in a secondary language if the page contains a taxonomy field.

Fatal error: Uncaught Error: Maximum call stack size of 8339456 bytes reached. Infinite recursion? in .../plugins/sitepress-multilingual-cms/vendor/wpml/fp/core/Strings.php:78

Workaround

Please, make sure of having a full site backup of your site before proceeding.

• Open the …/wp-content/plugins/acfml/classes/Options/EditorHooks.php file.
• Look for line 103.
• Replace:

  add_filter( 'acf/load_value', function( $value, $fieldPostId, $field ) use ( $postId ) {
          

• With:

  add_filter( 'acf/load_value', \WPML\FP\Fns::withNamedLock( self::class, \WPML\FP\Fns::identity(), function( $value, $fieldPostId, $field ) use ( $postId ) {
          

• Then, on line 134.
• Replace:

  }, 10, 3 );
          

• With:

  } ), 10, 3 );