diff --git a/app/Services/Pacs/Sync/StudiesSync.php b/app/Services/Pacs/Sync/StudiesSync.php
index 1130b21..524155c 100644
--- a/app/Services/Pacs/Sync/StudiesSync.php
+++ b/app/Services/Pacs/Sync/StudiesSync.php
@@ -144,6 +144,7 @@ public function transformData(mixed $orthanc_src): array
             $study['study_status'] = StudyLevelStatus::Pending->value;
         }
 
+        $study['patient_birthdate'] = null;
         $dob = data_get($orthanc_src, 'PatientMainDicomTags.PatientBirthDate');
         if (filled($dob)) {
             try {