diff --git a/src/controllers/02-user-controller.ts b/src/controllers/02-user-controller.ts
index 387ff0e..68b1503 100644
--- a/src/controllers/02-user-controller.ts
+++ b/src/controllers/02-user-controller.ts
@@ -46,6 +46,7 @@ import {
 } from "../services/permission";
 import { connectOrDisconnect, connectOrNot, whereAddressQuery } from "../utils/relation";
 import { isUsedError, notFoundError, relationError } from "../utils/error";
+import { retry } from "../utils/func";
 
 if (!process.env.MINIO_BUCKET) {
   throw Error("Require MinIO bucket.");
@@ -174,36 +175,38 @@ const permissionCond = createPermCondition(globalAllow);
 const permissionCheck = createPermCheck(globalAllow);
 
 async function userBranchCodeGen(user: User, branch: Branch) {
-  return await prisma.$transaction(
-    async (tx) => {
-      const typ = user.userType;
+  return await retry(() =>
+    prisma.$transaction(
+      async (tx) => {
+        const typ = user.userType;
 
-      const mapTypeNo = {
-        USER: 1,
-        MESSENGER: 2,
-        DELEGATE: 3,
-        AGENCY: 4,
-      }[typ];
+        const mapTypeNo = {
+          USER: 1,
+          MESSENGER: 2,
+          DELEGATE: 3,
+          AGENCY: 4,
+        }[typ];
 
-      const last = await tx.runningNo.upsert({
-        where: {
-          key: `BR_USR_${branch.code}_${mapTypeNo}`,
-        },
-        create: {
-          key: `BR_USR_${branch.code}_${mapTypeNo}`,
-          value: 1,
-        },
-        update: { value: { increment: 1 } },
-      });
+        const last = await tx.runningNo.upsert({
+          where: {
+            key: `BR_USR_${branch.code}_${mapTypeNo}`,
+          },
+          create: {
+            key: `BR_USR_${branch.code}_${mapTypeNo}`,
+            value: 1,
+          },
+          update: { value: { increment: 1 } },
+        });
 
-      return await tx.user.update({
-        where: { id: user.id },
-        data: {
-          code: mapTypeNo + `${last.value}`.padStart(6, "0"),
-        },
-      });
-    },
-    { isolationLevel: Prisma.TransactionIsolationLevel.Serializable },
+        return await tx.user.update({
+          where: { id: user.id },
+          data: {
+            code: mapTypeNo + `${last.value}`.padStart(6, "0"),
+          },
+        });
+      },
+      { isolationLevel: Prisma.TransactionIsolationLevel.Serializable },
+    ),
   );
 }