diff --git a/back/api/script.ts b/back/api/script.ts
index 419ace4a..9ad9beb4 100644
--- a/back/api/script.ts
+++ b/back/api/script.ts
@@ -129,6 +129,7 @@ export default (app: Router) => {
         content: Joi.string().optional().allow(''),
         originFilename: Joi.string().optional().allow(''),
         directory: Joi.string().optional().allow(''),
+        file: Joi.string().optional().allow(''),
       }),
     }),
     async (req: Request, res: Response, next: NextFunction) => {
diff --git a/back/shared/runCron.ts b/back/shared/runCron.ts
index 31f3ada4..9ccfdb05 100644
--- a/back/shared/runCron.ts
+++ b/back/shared/runCron.ts
@@ -15,11 +15,11 @@ export function runCron(cmd: string, cron: ICron): Promise<number | void> {
         });
 
         // Default to single instance mode (0) for backward compatibility
-        const allowMultipleInstances =
-          existingCron?.allow_multiple_instances === 1;
+        const allowSingleInstances =
+          existingCron?.allow_multiple_instances === 0;
 
         if (
-          !allowMultipleInstances &&
+          allowSingleInstances &&
           existingCron &&
           existingCron.pid &&
           (existingCron.status === CrontabStatus.running ||
diff --git a/back/validation/schedule.ts b/back/validation/schedule.ts
index 475859a1..ed212ab4 100644
--- a/back/validation/schedule.ts
+++ b/back/validation/schedule.ts
@@ -81,5 +81,5 @@ export const commonCronSchema = {
       'string.max': '日志名称不能超过100个字符',
       'string.unsafePath': '绝对路径必须在日志目录内或使用 /dev/null',
     }),
-  allow_multiple_instances: Joi.number().optional().valid(0, 1),
+  allow_multiple_instances: Joi.number().optional().valid(0, 1).allow(null),
 };