Display ‘Add to Cart’ button on product without price

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You can put this in your theme’s functions.php:

function custom_woocommerce_is_purchasable( $purchasable, $product ){
if( $product->get_price() == 0 ||  $product->get_price() == ”)
$purchasable = true;
return $purchasable;
}
add_filter( ‘woocommerce_is_purchasable’, ‘custom_woocommerce_is_purchasable’, 10, 2 );