diff --git a/KlaviyoV3Sdk/KlaviyoV3Api.php b/KlaviyoV3Sdk/KlaviyoV3Api.php
index a1e0b47..f22b727 100644
--- a/KlaviyoV3Sdk/KlaviyoV3Api.php
+++ b/KlaviyoV3Sdk/KlaviyoV3Api.php
@@ -432,8 +432,7 @@ public function buildCustomerProperties($customerProperties)
 
         $data = array(
             self::TYPE_KEY_PAYLOAD => self::PROFILE_KEY_PAYLOAD,
-            self::ATTRIBUTE_KEY_PAYLOAD => $kl_properties,
-            self::PROPERTIES => $customerProperties,
+            self::ATTRIBUTE_KEY_PAYLOAD => $kl_properties
         );
 
         if (isset($customerProperties['$id'])) {
@@ -441,6 +440,10 @@ public function buildCustomerProperties($customerProperties)
             unset($customerProperties['$id']);
         }
 
+        if(!empty($customerProperties)) {
+            $data[self::ATTRIBUTE_KEY_PAYLOAD][self::PROPERTIES] = $customerProperties;
+        }
+
         return array(
             self::PROFILE_KEY_PAYLOAD => array(
                 self::DATA_KEY_PAYLOAD => $data