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Hello,
The code below allows to refresh the product reference if the customer changes the color or the size.

prestashop.on(
	'updatedProduct',
 	function (event) {
 		updateReference();
	}
);

function updateReference() {
    ref = $('#product-details').data("product").attributes;
    if(ref) {
    	for (var i in ref)
        	$('#reference_product').html(ref[i].reference);
  	}
}

Unfortunately the code below, which is placed in custom.js does not work on prestashop 1.7.8, we have the error :

Uncaught TypeError: Cannot read properties of undefined (reading 'attributes')

We use the following theme : http://ps.ariestheme.com/themes/sp_autostore/fr/

Would you have a solution for me ?

Could you help me to correct?

Sorry for my English and thank you in advance.