diff --git a/app/Config/Routes.php b/app/Config/Routes.php
index d640d843..10fb373c 100755
--- a/app/Config/Routes.php
+++ b/app/Config/Routes.php
@@ -172,6 +172,7 @@ $routes->group("/client", ["filter" => "authMVC"], function ($routes) {
 
     $routes->group("others", ["filter" => "authMVC"], function ($routes) {
         $routes->post("create", "ClientController::createOtherTabContent");
+        $routes->post('check-duplicate', 'ClientController::validateDuplicateByClientBranch');
     });
 });
 
diff --git a/app/Controllers/ClientController.php b/app/Controllers/ClientController.php
index 63ddac11..fb0c5d6f 100755
--- a/app/Controllers/ClientController.php
+++ b/app/Controllers/ClientController.php
@@ -132,6 +132,15 @@ class ClientController extends AdminController
 
     //--------------------------------------------------------------------------------------------------------
 
+    public function validateDuplicateByClientBranch()
+    {
+        $request = service('request');
+        $value = $request->getPost('value');
+        $clientId = $request->getPost('client_id');
+        $branchId = $request->getPost('branch_id');
+        $isDuplicate = $this->clientModel->isDuplicateByClientBranch($value, $clientId, $branchId);
+        return $this->response->setJSON(['isDuplicate' => $isDuplicate]);
+    }
     public function checkDuplicateTableFieldValue()
     {
         $table = $this->request->getPost('table');
diff --git a/app/Models/ClientModel.php b/app/Models/ClientModel.php
index 9abe8929..09db986d 100755
--- a/app/Models/ClientModel.php
+++ b/app/Models/ClientModel.php
@@ -226,5 +226,18 @@ class ClientModel extends Model
         return $result;
     }
 
+    public function isDuplicateByClientBranch($email, $clientId, $branchId)
+    {
+        $builder = $this->db->table('level_contacts lc')
+            ->select('lc.id')
+            ->join('client_branch cb', 'lc.ref_id = cb.id', 'left')
+            ->where('lc.email', $email)
+            ->where('lc.contact_type', 'client')
+            ->where('cb.client_id', $clientId)
+            ->where('lc.ref_id', $branchId)
+            ->get();
+
+        return $builder->getNumRows() > 0 ? true : false;
+    }
 }
 
diff --git a/app/Views/client_branch.php b/app/Views/client_branch.php
index f35d5f99..4db64b3b 100755
--- a/app/Views/client_branch.php
+++ b/app/Views/client_branch.php
@@ -649,7 +649,7 @@ function appendContactHtml(contact = false, reset = false) {
                 <div class="form-row">
                     <div class="form-group col-md-6">
                         <label for="${uniqueId}_last_name">Email<span class="text-danger">*</span></label>
-                        <input value="${contact !== undefined && contact !== false ? contact.email : ''}" type="text" class="form-control" placeholder="Enter Contact Email" name="email[]" id="${uniqueId}_email" data-parsley-trigger="change" data-parsley-type="email" onkeyup="validateInput(this, 'level_contacts', 'email', 'branchBtnSubmit')" required>
+                        <input value="${contact !== undefined && contact !== false ? contact.email : ''}" type="text" class="form-control" placeholder="Enter Contact Email" name="email[]" id="${uniqueId}_email" data-parsley-trigger="change" data-parsley-type="email" onkeyup="validateDuplicateByClientBranch(this, 'branchBtnSubmit')" required>
                     </div>
                     <div class="form-group col-md-6">
                         <label for="${uniqueId}_mobile">Mobile<span class="text-danger">*</span></label>
@@ -972,6 +972,57 @@ function validateInput(input, table, field, submitButId){
 
 }
 
+function validateDuplicateByClientBranch(input, submitButId) {
+    let value = $(input).val().trim();
+    let clientId = $('#client_id_branch').val();
+    let branchId = $('#branch_id_primarykey').val();
+    console.log(`Ln968 cId: ${clientId} | bId: ${branchId}`);
+    
+    // Don't forgot be careful
+    // 1 Local duplication check (User entered)
+    let isLocalDuplicate = false;
+    $('input[name="email[]"]').each(function() {
+        if (this !== input && $(this).val().trim() === value && value !== '') {
+            isLocalDuplicate = true;
+            return false; // break loop
+        }
+    });
+
+    if (isLocalDuplicate) {
+        console.log(`r u n Local`);
+        toastr.warning("Email is duplicate!", 'WARNING');
+        $('#' + submitButId).prop('disabled', true);
+        return; // don’t call server if duplicate in UI
+    }
+    
+    // Don't forgot be careful
+    // 2 Server-side duplicate check (DB)
+    if (!isLocalDuplicate && value !== '') {
+        console.log(`r u n Server`);
+        $.ajax({
+            url: '<?= base_url("client/others/check-duplicate") ?>',
+            type: 'POST',
+            data: { 
+                client_id: clientId,
+                branch_id: branchId,
+                value: value
+            },
+            dataType: 'json',
+            success: function(response) {
+                if (response.isDuplicate) {
+                    toastr.warning("Email already exists!", 'WARNING');
+                    $('#' + submitButId).prop('disabled', true);
+                } else {
+                    $('#' + submitButId).prop('disabled', false);
+                }
+            },
+            error: function(xhr, status, error) {
+                console.error('AJAX Error:', error);
+            }
+        });
+    }
+}
+
 function getContactsData() {
     const contacts = [];