Woo-RFQ for WooCommerce – zip postcode issue

Dear friends, I’ve installed the Woo-RFQ for WooCommerce version 1.7.985 with Woocommerce version 2.6.11.

Your plugin is perfect for my purpose that is just to shoew the products without prices and the costumer ask for a quote.

Everything is going well, except for the “zip postcode issue”.
I’m using all with RFQ;
the country selected is opnly Brazil;
without include shipping costs;
and the zip code is placed manually.

When I disable the plugin, the purchase is compelted normally and the zipcode (CEP in Brazil) is accepted normally.

Could you help me in this issue?