diff --git a/.gitignore b/.gitignore
index f14cc4d..0fb94d9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 node_modules
 
-package-lock.json
\ No newline at end of file
+package-lock.json
+/exthernal-rentroom-api
diff --git a/exthernal-accountingwep-api/.env b/exthernal-accountingwep-api/.env
index f4c11cd..c57b980 100644
--- a/exthernal-accountingwep-api/.env
+++ b/exthernal-accountingwep-api/.env
@@ -13,7 +13,7 @@ SMTP_USER=lalisakuty@gmail.com
 SMTP_PASS=lurl pckw qugk tzob
 
 # REDIS
-REDIS_HOST=10.9.0.0x
+REDIS_HOST=10.9.0.0
 REDIS_PORT=6379
 OTP_TTL_SECONDS=300
 
diff --git a/exthernal-login-api/src/controllers/registercontroller.js b/exthernal-login-api/src/controllers/registercontroller.js
index 28f1c83..ca8e140 100644
--- a/exthernal-login-api/src/controllers/registercontroller.js
+++ b/exthernal-login-api/src/controllers/registercontroller.js
@@ -23,18 +23,20 @@ export class RegisterController {
   async onRegisterController(req, res, database) {
     let idx = -1
     let result = []
+    let aryUserDuplicate = [];
     try {
       // 1. ดึง Sequence ล่าสุดจาก Service (เพื่อเอามา +1)
-      const Seq = await this.registerService.genNum(database);
+      var Seq = await this.registerService.genNum(database);
 
       // 2. Hash Password
       let passwordRaw = req.body.request.password;
       const saltRounds = 10;
-      const hashedPassword = await bcrypt.hash(passwordRaw, saltRounds);
+      var hashedPassword = await bcrypt.hash(passwordRaw, saltRounds);
 
       // 3. เรียก makeArySave เพื่อเตรียมข้อมูลและบันทึกผ่าน saveInterface
       // ส่ง nextSeq และ hashedPassword เข้าไป
-      result = await this.makeArySave(req, Seq, hashedPassword);
+      aryUserDuplicate = await this.registerService.checkUserDuplicate(database, req.body.request.email);
+    
       
       this.generalService.devhint(1, 'registercontroller.js', 'Register success');
 
@@ -42,6 +44,8 @@ export class RegisterController {
       idx = 1;
     } finally { 
       if (idx === 1) return sendError('เกิดข้อผิดพลาดไม่คาดคิดเกิดขึ้น', 'Unexpected error');
+      if (aryUserDuplicate.length > 0) return sendError('มีชื่อผู้ใช้หรืออีเมลนี้ในระบบแล้ว', 'Username or Email already exists');
+      result = await this.makeArySave(req, Seq, hashedPassword);
       if (!result) return sendError('ไม่สามารถลงทะเบียนได้', 'Registration failed');
       return result 
     }
@@ -51,10 +55,10 @@ export class RegisterController {
     // Map ข้อมูลเข้า Field ตามตาราง usrmst
     let arysave = {
         methods: 'post',           // สั่งให้ saveInterface ทำการ INSERT
-        usrseq: seq + 1,           // PK: integer
+        usrseq: seq,           // PK: integer
         usrnam: validateSave(req.body.request.username, 'username'),        
         usrpwd: hashedPassword,    // character varying(255)
-        usreml: validateSave(req.body.request.email, 'Email'),    // character varying(50)
+        usreml: req.body.request.email,    // character varying(50)
         usrthinam: validateSave(req.body.request.firstname, 'firstname'), // character varying(100)
         usrthilstnam: validateSave(req.body.request.lastname, 'lastname'), // character varying(100)
         
diff --git a/exthernal-login-api/src/services/registerservice.js b/exthernal-login-api/src/services/registerservice.js
index db27d5a..184c4c7 100644
--- a/exthernal-login-api/src/services/registerservice.js
+++ b/exthernal-login-api/src/services/registerservice.js
@@ -40,6 +40,15 @@ export class RegisterService {
     }
   }
 
+  async checkUserDuplicate(database, email) {
+    const sql = `
+      SELECT * FROM nuttakit.usrmst
+      WHERE usreml = $1
+    `
+    const params = [email]
+    const aryResult = await this.generalService.executeQueryParam(database, sql, params);
+    return aryResult;
+  }
 
   async genNum(database) {
     const sql = `