Advanced Custom Fields – Uncaught TypeError: md5(): Argument #1 ($string) Must Be of Type String, Array Given In…

Overview of the Issue

If you’re using the Advanced Custom Fields plugin with WPML, you might encounter a PHP fatal error like the following:

PHP Fatal error: Uncaught TypeError: md5(): Argument #1 ($string) must be of type string, array given in .../wp-content/plugins/acfml/classes/Strings/Package.php:97

Workaround

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

• Open …/wp-content/plugins/acfml/classes/Strings/Traversable/Field.php file.
• Look for line 24.
• Change:

  protected function transform( Transformer $transformer, $value, $config ) {
  	if ( is_array( $value ) ) {
  		foreach ( $value as $key => $label ) {
  			$value[ $key ] = $transformer->transform( $label, $config );
  		}
  	} else {
  		$value = $transformer->transform( $value, $config );
  	}
  
  	return $value;
  }

• For:

  	protected function transform( Transformer $transformer, $value, $config ) {
  		if ( is_array( $value ) ) {
  			foreach ( $value as $key => $label ) {
          if ( is_string( $label ) ) {
      				$value[ $key ] = $transformer->transform( $label, $config );
          }
  			}
  		} else {
  			$value = $transformer->transform( $value, $config );
  		}
  
  		return $value;
  	}

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