Advanced Custom Fields: Extended – Fatal Error: Uncaught InvalidArgumentException: Item Should Be a Collection or an Array or an Object In…

Overview of the Issue

You may experience a fatal error after updating the Advanced Custom Fields Multilingual plugin to version 2.1.4.1 when also using the Advanced Custom Fields: Extended and Advanced Custom Fields Pro plugins:

Fatal error: Uncaught InvalidArgumentException: item should be a Collection or an array or an object in .../wp-content/plugins/sitepress-multilingual-cms/vendor/wpml/fp/core/Obj.php:112

Workaround

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

• Open …/wp-content/plugins/acfml/classes/class-wpml-acf-options-page.php file.
• Look for line 280.
• Replace:

  private static function isValidOptionPagePostId( $postId ) {
  	return function_exists( 'acf_get_options_pages' )
  	       && wpml_collect( acf_get_options_pages() )->first( Relation::propEq( 'post_id', $postId ) );
  }

• With:

  private static function isValidOptionPagePostId( $postId ) {
  	if ( function_exists( 'acf_get_options_pages' ) ) {
  		$optionPages = acf_get_options_pages();
  
  		if ( $optionPages ) {
  			return wpml_collect( acf_get_options_pages() )->first( Relation::propEq( 'post_id', $postId ) );
  		}		
  	}
  
  	return false;
  }

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