Warning: Missing argument 2 for acf_Select::acf_save_field()

When saving a field-group which contains a select or a radio, I get an annoying error message on customers production server (PHP 5.3.8, SunOS) which does not occur on customers development server (PHP 5.4.8, Win XP):

Warning: Missing argument 2 for acf_Select::acf_save_field() in /var/../htdocs/wp-content/plugins/advanced-custom-fields/core/fields/select.php on line 267

Warning: Cannot modify header information - headers already sent by (output started at /var/../htdocs/wp-content/plugins/advanced-custom-fields/core/fields/select.php:267) in /var/../htdocs/wp-includes/pluggable.php on line 881

The field-group is saved ok, but the “save-result” page in admin is above message on a plain white page.

The production server db/php is an exact clone of the development server, the only difference is PHP version and OS.

Tried to track down the problem in ACF 3.5.3 and found a workaround.

Old code, line 24, file advanced-custom-fields/core/fields/select.php:

// filters (for all fields with choices)
add_filter('acf_save_field-select', array($this, 'acf_save_field'));
add_filter('acf_save_field-checkbox', array($this, 'acf_save_field'));
add_filter('acf_save_field-radio', array($this, 'acf_save_field'));

Changed code, line 24, file advanced-custom-fields/core/fields/select.php:

// filters (for all fields with choices)
add_filter('acf_save_field-select', array($this, 'acf_save_field'), 10, 2);
add_filter('acf_save_field-checkbox', array($this, 'acf_save_field'), 10, 2);
add_filter('acf_save_field-radio', array($this, 'acf_save_field'), 10, 2);

Not really sure why this is required to get past the error on the production server, maybe somebody can confirm if this really is a PHP version problem or something else.

http://wordpress.org/extend/plugins/advanced-custom-fields/