diff --git a/src/controllers/branch-controller.ts b/src/controllers/branch-controller.ts
index d9dcda9..9aa12a3 100644
--- a/src/controllers/branch-controller.ts
+++ b/src/controllers/branch-controller.ts
@@ -36,7 +36,7 @@ type BranchCreate = {
   zipCode: string;
   email: string;
   contactName?: string | null;
-  contact: string | string[];
+  contact?: string | string[] | null;
   telephoneNo: string;
   lineId?: string | null;
   longitude: string;
@@ -59,7 +59,7 @@ type BranchUpdate = {
   email?: string;
   telephoneNo: string;
   contactName?: string;
-  contact?: string | string[];
+  contact?: string | string[] | null;
   lineId?: string;
   longitude?: string;
   latitude?: string;
@@ -382,14 +382,15 @@ export class BranchController extends Controller {
       where: { id: branchId },
     });
 
-    if (record && contact) {
+    if (record && contact !== undefined) {
       await prisma.branchContact.deleteMany({ where: { branchId } });
-      await prisma.branchContact.createMany({
-        data:
-          typeof contact === "string"
-            ? [{ telephoneNo: contact, branchId }]
-            : contact.map((v) => ({ telephoneNo: v, branchId })),
-      });
+      contact &&
+        (await prisma.branchContact.createMany({
+          data:
+            typeof contact === "string"
+              ? [{ telephoneNo: contact, branchId }]
+              : contact.map((v) => ({ telephoneNo: v, branchId })),
+        }));
     }
 
     return Object.assign(record, {