diff --git a/backend/src/main/java/core/api/controller/ScheduleController.java b/backend/src/main/java/core/api/controller/ScheduleController.java
index 4ef4130..3949347 100644
--- a/backend/src/main/java/core/api/controller/ScheduleController.java
+++ b/backend/src/main/java/core/api/controller/ScheduleController.java
@@ -75,6 +75,9 @@ public class ScheduleController {
 
         if(scheduleFieldInfo instanceof BasicScheduleFieldInfo) {
             ServiceResult<AbstractSchedule> scheduleResult = taskScheduleService.scheduleBasic(permissionResult.getResult(), (BasicScheduleFieldInfo) scheduleFieldInfo);
+            if(scheduleResult.getExitCode() == ServiceExitCode.INVALID_OPERATION) {
+                return ResponseEntity.status(400).body(new SimpleStatusResponse("failed"));
+            }
             return ResponseEntity.ok(scheduleResult.getResult().toScheduleInfo());
         } else if(scheduleFieldInfo instanceof AdvancedScheduleFieldInfo) {
             ServiceResult<AbstractSchedule> scheduleResult = taskScheduleService.scheduleAdvanced(permissionResult.getResult(), (AdvancedScheduleFieldInfo) scheduleFieldInfo);