diff --git a/app/code/Magento/CustomerGraphQl/Model/Customer/ValidateCustomerData.php b/app/code/Magento/CustomerGraphQl/Model/Customer/ValidateCustomerData.php
index 1e4b653c13de3..47386e5152347 100644
--- a/app/code/Magento/CustomerGraphQl/Model/Customer/ValidateCustomerData.php
+++ b/app/code/Magento/CustomerGraphQl/Model/Customer/ValidateCustomerData.php
@@ -47,7 +47,10 @@ public function execute(array $customerData, $addRequiredAttributes = false): vo
         $errorInput = [];
 
         foreach ($attributes as $attributeInfo) {
-            if ($attributeInfo->getIsRequired() && $customerData[$attributeInfo->getAttributeCode()] == '') {
+            if ($attributeInfo->getIsRequired()
+                && (!isset($customerData[$attributeInfo->getAttributeCode()])
+                    || $customerData[$attributeInfo->getAttributeCode()] == '')
+            ) {
                 $errorInput[] = $attributeInfo->getDefaultFrontendLabel();
             }
         }