diff --git a/src/controllers/EvaluationController.ts b/src/controllers/EvaluationController.ts
index 622060e..09a09bc 100644
--- a/src/controllers/EvaluationController.ts
+++ b/src/controllers/EvaluationController.ts
@@ -2630,13 +2630,22 @@ export class EvaluationController {
       if (!evaluation) {
         throw new HttpError(HttpStatusCode.NOT_FOUND, "not found.");
       }
-      if (!evaluation.evaluation_directors_director) {
-        evaluation.evaluation_directors_director = [];
-      }
-      body.directors.forEach(async (directorId) => {
+      // ดึง directors เดิมที่มีอยู่
+      const existingDirectors = await this.evaluation_directors_directorRepository.find({
+        where: { evaluationId: evaluation.id },
+      });
+      const existingDirectorIds = new Set(existingDirectors.map((d) => d.directorId));
+
+      // เพิ่ม directors ใหม่ที่ยังไม่มี
+      const newDirectors = [];
+      for (const directorId of body.directors) {
+        // ข้ามถ้ามีอยู่แล้ว
+        if (existingDirectorIds.has(directorId)) {
+          continue;
+        }
         const director = await this.directorRepository.findOne({ where: { id: directorId } });
         if (director != null) {
-          await this.evaluation_directors_directorRepository.save({
+          newDirectors.push({
             directorId: director.id,
             evaluationId: evaluation.id,
             createdUserId: request.user.sub,
@@ -2646,8 +2655,12 @@ export class EvaluationController {
             createdAt: new Date(),
             lastUpdatedAt: new Date(),
           });
+          existingDirectorIds.add(director.id); // เพิ่มเพื่อป้องกันซ้ำใน batch เดียวกัน
         }
-      });
+      }
+      if (newDirectors.length > 0) {
+        await this.evaluation_directors_directorRepository.insert(newDirectors);
+      }
 
       evaluation.lastUpdateUserId = request.user.sub;
       evaluation.lastUpdateFullName = request.user.name;