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Thanks for your reply.

The problem is when I try to add second product with the same attribute. If I change attribute, ex. color, i can add correctly.

This is the URL of the product: https://www.tuttoperinfissi.com/index.php?id_product=88&id_product_attribute=1490&rewrite=tapparella-avvolgibile-in-alluminio-coibentato-con-poliuretano-media-densita-pinto-as-55&controller=product#/98-colori_pinto-1_bianco_ral