diff --git a/app/Http/Resources/IndexSttMedicalHistoryResource.php b/app/Http/Resources/IndexSttMedicalHistoryResource.php
index c0c68b7..f86ed17 100644
--- a/app/Http/Resources/IndexSttMedicalHistoryResource.php
+++ b/app/Http/Resources/IndexSttMedicalHistoryResource.php
@@ -57,7 +57,7 @@ class IndexSttMedicalHistoryResource extends JsonResource
             ? "$archiveInfoMisCardNumber / $archiveInfoFoxproCardNumber"
             : $archiveInfoMisCardNumber ?? $archiveInfoFoxproCardNumber;
 
-        $department = $historyType === 'mis' ? $model->outcomeMigration->stationarBranch->department : null;
+        $department = $historyType === 'mis' ? $model->outcomeMigration?->stationarBranch->department : null;
 
         return [
             'id' => $id,