fix : onpage fix

app/design/frontend/Joshine/breeze/Magento_Checkout/templates/onepage.phtml

@@ -896,7 +896,7 @@ $full_free_ship = $_helper->currency($full_free, true, false);
     <?php $serializedCheckoutConfig = /* @noEscape */ $block->getSerializedCheckoutConfig();
     $scriptString = <<<script
         window.checkoutConfig = {$serializedCheckoutConfig};
-        window.checkoutConfig.flatrate_price = {$flatraPrice};
+        window.checkoutConfig.flatrate_price = '{$flatraPrice}';
         window.checkoutConfig.full_free_ship = '{$full_free_ship}';
         // Create aliases for customer.js model from customer module
         window.isCustomerLoggedIn = window.checkoutConfig.isCustomerLoggedIn;