diff --git a/app/Http/Controllers/Apis/Protected/Summit/OAuth2SummitOrdersApiController.php b/app/Http/Controllers/Apis/Protected/Summit/OAuth2SummitOrdersApiController.php
index 98a07bad..1f4abff6 100644
--- a/app/Http/Controllers/Apis/Protected/Summit/OAuth2SummitOrdersApiController.php
+++ b/app/Http/Controllers/Apis/Protected/Summit/OAuth2SummitOrdersApiController.php
@@ -114,12 +114,24 @@ final class OAuth2SummitOrdersApiController
                     'owner_email'      => 'required|string|max:255|email',
                 ], $validation_rules);
             }
+            else{
+                if(empty($owner->getFirstName())){
+                    $validation_rules = array_merge([
+                        'owner_first_name' => 'required|string|max:255',
+                    ], $validation_rules);
+                }
+                if(empty($owner->getLastName())){
+                    $validation_rules = array_merge([
+                        'owner_last_name' => 'required|string|max:255',
+                    ], $validation_rules);
+                }
+            }
 
             $payload = $this->getJsonPayload($validation_rules);
             if(!is_null($owner)){
                 $payload_ex = [
-                    'owner_first_name' => $owner->getFirstName(),
-                    'owner_last_name'  => $owner->getLastName(),
+                    'owner_first_name' => !empty($owner->getFirstName()) ? $owner->getFirstName() : $payload['owner_first_name'],
+                    'owner_last_name'  => !empty($owner->getLastName()) ? $owner->getLastName() : $payload['owner_last_name'],
                     'owner_email'      => $owner->getEmail(),
                 ];
                 $payload = array_merge($payload, $payload_ex);
diff --git a/app/Models/Foundation/Main/Member.php b/app/Models/Foundation/Main/Member.php
index bf873fc7..809ec3dc 100644
--- a/app/Models/Foundation/Main/Member.php
+++ b/app/Models/Foundation/Main/Member.php
@@ -630,17 +630,17 @@ class Member extends SilverstripeBaseModel
     }
 
     /**
-     * @return string
+     * @return string|null
      */
-    public function getLastName()
+    public function getLastName():?string
     {
         return $this->last_name;
     }
 
     /**
-     * @return string
+     * @return string|null
      */
-    public function getFirstName()
+    public function getFirstName():?string
     {
         return $this->first_name;
     }
diff --git a/app/Models/Foundation/Summit/Registration/SummitOrder.php b/app/Models/Foundation/Summit/Registration/SummitOrder.php
index 4e6c42c0..d977b278 100644
--- a/app/Models/Foundation/Summit/Registration/SummitOrder.php
+++ b/app/Models/Foundation/Summit/Registration/SummitOrder.php
@@ -239,7 +239,7 @@ class SummitOrder extends SilverstripeBaseModel implements IQREntity
 
         $lname = $this->getOwnerSurname();
         if(empty($lname))
-            throw new ValidationException("owner first last name is null");
+            throw new ValidationException("owner last name is null");
 
         $token = $this->number.'.'.$email.'.'.$fname.".".$lname;
         $token = $token . random_bytes(16).time();
diff --git a/app/Services/Model/Imp/SummitOrderService.php b/app/Services/Model/Imp/SummitOrderService.php
index b712bc66..242df195 100644
--- a/app/Services/Model/Imp/SummitOrderService.php
+++ b/app/Services/Model/Imp/SummitOrderService.php
@@ -897,6 +897,21 @@ final class SummitOrderService
     {
 
         try {
+            $owner = $this->tx_service->transaction(function () use ($owner, $payload) {
+                if (is_null($owner)) return null;
+
+                $owner = $this->member_repository->getByIdExclusiveLock($owner->getId());
+
+                if (empty($owner->getFirstName())) {
+                    $owner->setFirstName($payload['owner_first_name']);
+                }
+
+                if (empty($owner->getLastName())) {
+                    $owner->setLastName($payload['owner_last_name']);
+                }
+
+                return $owner;
+            });
             $state = Saga::start()
                 ->addTask(new PreOrderValidationTask($summit, $payload, $this->tx_service))
                 ->addTask(new PreProcessReservationTask($payload))
@@ -1785,14 +1800,14 @@ final class SummitOrderService
                 Log::debug(sprintf("SummitOrderService::createOrderSingleTicket attendee is null"));
                 //first name
                 $first_name = isset($payload['owner_first_name']) ? trim($payload['owner_first_name']) : null;
-                if (empty($first_name) && !is_null($owner)) $first_name = $owner->getFirstName();
+                if (empty($first_name) && !is_null($owner) && !empty($owner->getFirstName())) $first_name = $owner->getFirstName();
                 if (empty($first_name)) {
                     Log::warning("SummitOrderService::createOrderSingleTicket owner firstname is null");
                     throw new ValidationException("you must provide an owner_first_name or a valid owner_id");
                 }
                 // surname
                 $surname = isset($payload['owner_last_name']) ? trim($payload['owner_last_name']) : null;
-                if (empty($surname) && !is_null($owner)) $surname = $owner->getLastName();
+                if (empty($surname) && !is_null($owner) && !empty($owner->getLastName())) $surname = $owner->getLastName();
                 if (empty($surname)) {
                     Log::warning("SummitOrderService::createOrderSingleTicket owner surname is null");
                     throw new ValidationException("you must provide an owner_last_name or a valid owner_id");
diff --git a/app/Services/Model/dto/ExternalUserDTO.php b/app/Services/Model/dto/ExternalUserDTO.php
index 5825b7e3..60737bba 100644
--- a/app/Services/Model/dto/ExternalUserDTO.php
+++ b/app/Services/Model/dto/ExternalUserDTO.php
@@ -55,7 +55,7 @@ class ExternalUserDTO
      * @param bool $active
      * @param bool $email_verified
      */
-    public function __construct($id, string $email, string $first_name, string $last_name, bool $active = false, bool $email_verified = false)
+    public function __construct($id, string $email, ?string $first_name, ?string $last_name, bool $active = false, bool $email_verified = false)
     {
         $this->id = $id;
         $this->email = $email;
@@ -82,7 +82,7 @@ class ExternalUserDTO
     }
 
     /**
-     * @return string
+     * @return string|null
      */
     public function getFirstName(): ?string
     {
@@ -90,7 +90,7 @@ class ExternalUserDTO
     }
 
     /**
-     * @return string
+     * @return string|null
      */
     public function getLastName(): ?string
     {