diff --git a/backend/services/admin-service/src/infrastructure/jobs/contract-batch-download.job.ts b/backend/services/admin-service/src/infrastructure/jobs/contract-batch-download.job.ts
index 5c61e9c0..4e8e274e 100644
--- a/backend/services/admin-service/src/infrastructure/jobs/contract-batch-download.job.ts
+++ b/backend/services/admin-service/src/infrastructure/jobs/contract-batch-download.job.ts
@@ -210,7 +210,7 @@ export class ContractBatchDownloadJob implements OnModuleInit {
             failedCount,
             progress,
             lastProcessedOrderNo: contract.orderNo,
-            errors: errors.length > 0 ? errors : null,
+            errors: errors.length > 0 ? errors : undefined,
           },
         });
         this.logger.log(`进度: ${progress}% (${downloadedCount}/${totalContracts})`);
@@ -245,7 +245,7 @@ export class ContractBatchDownloadJob implements OnModuleInit {
         progress: 100,
         resultFileUrl,
         resultFileSize: BigInt(zipStats.size),
-        errors: errors.length > 0 ? errors : null,
+        errors: errors.length > 0 ? errors : undefined,
         completedAt: new Date(),
         expiresAt: new Date(Date.now() + 7 * 24 * 60 * 60 * 1000), // 7天后过期
       },