diff --git a/src/Action/CustomerFieldsActions.php b/src/Action/CustomerFieldsActions.php
index 20be485f..e9ea00ae 100644
--- a/src/Action/CustomerFieldsActions.php
+++ b/src/Action/CustomerFieldsActions.php
@@ -91,8 +91,9 @@ public function addDocumentField(array $fields): array
     public function addDocumentFieldOnCheckoutBlocks()
     {
         if (
-            $this->customerFields->hasCheckoutBlocksDocumentField()
-            || !function_exists('woocommerce_register_additional_checkout_field')
+            Utils::isCheckoutBlocksActive() &&
+            ($this->customerFields->hasCheckoutBlocksDocumentField()
+            || !function_exists('woocommerce_register_additional_checkout_field'))
         ) {
             return;
         }
diff --git a/src/Helper/Utils.php b/src/Helper/Utils.php
index 776103c0..c37c5c51 100644
--- a/src/Helper/Utils.php
+++ b/src/Helper/Utils.php
@@ -677,4 +677,15 @@ public static function getRegisterScriptParameters(string $path, string $fileNam
             'ver'  => self::getScriptVersion($path, $fileName)
         ];
     }
+
+    /**
+     * @return bool
+     */
+    public static function isCheckoutBlocksActive()
+    {
+        if (!class_exists('\Automattic\WooCommerce\Blocks\Utils\CartCheckoutUtils')) {
+            return false;
+        }
+        return \Automattic\WooCommerce\Blocks\Utils\CartCheckoutUtils::is_checkout_block_default();
+    }
 }