diff --git a/database/migrations/2026_05_25_220000_sync_dns_server_references_and_add_foreign_keys.php b/database/migrations/2026_05_25_220000_sync_dns_server_references_and_add_foreign_keys.php
index 04f7f19..790232b 100644
--- a/database/migrations/2026_05_25_220000_sync_dns_server_references_and_add_foreign_keys.php
+++ b/database/migrations/2026_05_25_220000_sync_dns_server_references_and_add_foreign_keys.php
@@ -10,15 +10,24 @@ return new class extends Migration
         $serverId = $this->resolveCanonicalServerId();
 
         if ($serverId === null) {
-            throw new RuntimeException('Không tìm thấy dns_manager_servers để sync foreign key.');
-        }
+            $hasOrphaned = DB::table('dns_manager_domain as d')
+                ->leftJoin('dns_manager_servers as s', 's.id', '=', 'd.dns_manager_server_id')
+                ->where(function ($q) {
+                    $q->where('d.dns_manager_server_id', 0)->orWhereNull('s.id');
+                })
+                ->exists();
 
-        DB::statement("
-            UPDATE dns_manager_domain d
-            LEFT JOIN dns_manager_servers s ON s.id = d.dns_manager_server_id
-            SET d.dns_manager_server_id = {$serverId}
-            WHERE d.dns_manager_server_id = 0 OR s.id IS NULL
-        ");
+            if ($hasOrphaned) {
+                throw new RuntimeException('Không tìm thấy dns_manager_servers để sync foreign key cho các bản ghi orphaned.');
+            }
+        } else {
+            DB::statement("
+                UPDATE dns_manager_domain d
+                LEFT JOIN dns_manager_servers s ON s.id = d.dns_manager_server_id
+                SET d.dns_manager_server_id = {$serverId}
+                WHERE d.dns_manager_server_id = 0 OR s.id IS NULL
+            ");
+        }
 
         DB::statement('ALTER TABLE dns_manager_domain MODIFY dns_manager_server_id BIGINT UNSIGNED NOT NULL');
         DB::statement('ALTER TABLE dns_manager_ns MODIFY dns_manager_domain_id BIGINT UNSIGNED NOT NULL');