Prevent access to checkout without shipping method in WooCommerce

You should better try with the “Chosen shipping method” from WooCommerce session like:

function disable_checkout_button_no_shipping() {

    $chosen_shipping_methods = WC()->session->get( 'chosen_shipping_methods' );

    // remove button if there is no chosen shipping method
    if( empty( $chosen_shipping_methods ) ) {
        remove_action( 'woocommerce_proceed_to_checkout', 'woocommerce_button_proceed_to_checkout', 20 );
    }
}
add_action( 'woocommerce_proceed_to_checkout', 'disable_checkout_button_no_shipping', 1 );

Or in a different way using woocommerce_check_cart_items action hook:

add_action( 'woocommerce_check_cart_items', 'required_chosen_shipping_methods' );
function required_chosen_shipping_methods() {
    $chosen_shipping_methods = WC()->session->get( 'chosen_shipping_methods' );

    if( is_array( $chosen_shipping_methods ) && count( $chosen_shipping_methods ) > 0 ) {
        // Display an error message
        wc_add_notice( __("A shipping method is required in order to proceed to checkout."), 'error' );
    }
}

It should better work.

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