Custom fields never import

When importing contact with custom fields, almost all of them never get imported.

After some search found that this static function => CRM_Core_BAO_CustomField::formatCustomField receive an array ($customFormatted) by reference.

Line 2110 of CRM_Contact_BAO_Contact.php

In my case it returns empty sub arrays for almost every custom field.

By using the return of the function like this => $foo = CRM_Core_BAO_CustomField::formatCustomField instead in addition to the referenced variable.

And adding this line just before line 2182 => $data['custom'] = $foo;

I managed to solve it.

Hope it's ok this way