diff --git a/src/pages/03_customer-management/form.ts b/src/pages/03_customer-management/form.ts
index 441e892b..51ef0777 100644
--- a/src/pages/03_customer-management/form.ts
+++ b/src/pages/03_customer-management/form.ts
@@ -253,7 +253,7 @@ export const useCustomerForm = defineStore('form-customer', () => {
           : '',
       registerCompanyName: '',
       contactName: '',
-      file: undefined,
+      file: [],
     });
     state.value.branchIndex =
       (currentFormData.value.customerBranch?.length || 0) - 1;
@@ -345,7 +345,7 @@ export const useCustomerBranchForm = defineStore('form-customer-branch', () => {
     registerCompanyName: '',
     statusSave: false,
     contactName: '',
-    file: undefined,
+    file: [],
   };
 
   let resetFormData = structuredClone(defaultFormData);
@@ -411,7 +411,7 @@ export const useCustomerBranchForm = defineStore('form-customer-branch', () => {
       contactName: _data.contactName,
       registerCompanyName: '',
       statusSave: false,
-      file: undefined,
+      file: [],
     };
 
     currentFormData.value = structuredClone(resetFormData);