diff --git a/workflow-engine-core/src/main/java/cn/axzo/workflow/core/engine/cmd/CustomBackTaskCmd.java b/workflow-engine-core/src/main/java/cn/axzo/workflow/core/engine/cmd/CustomBackTaskCmd.java
index 78b4198c9..b3db09fcd 100644
--- a/workflow-engine-core/src/main/java/cn/axzo/workflow/core/engine/cmd/CustomBackTaskCmd.java
+++ b/workflow-engine-core/src/main/java/cn/axzo/workflow/core/engine/cmd/CustomBackTaskCmd.java
@@ -140,7 +140,9 @@ public class CustomBackTaskCmd extends AbstractCommand<Void> implements Serializ
         }
         ((TaskEntity) task).setTransientVariable(TASK_COMPLETE_OPERATION_TYPE + taskId, APPROVED.getStatus());
 
-        runtimeService.createChangeActivityStateBuilder().moveActivityIdsToSingleActivityId(Collections.singletonList(currentActivityId),toActivityId);
+        runtimeService.createChangeActivityStateBuilder()
+                .processInstanceId(task.getProcessInstanceId())
+                .moveActivityIdsToSingleActivityId(Collections.singletonList(currentActivityId),toActivityId).changeState();
         return null;
     }
 
diff --git a/workflow-engine-server/src/main/java/cn/axzo/workflow/server/controller/web/bpmn/BpmnProcessTaskController.java b/workflow-engine-server/src/main/java/cn/axzo/workflow/server/controller/web/bpmn/BpmnProcessTaskController.java
index e539cf42a..85b71c29a 100644
--- a/workflow-engine-server/src/main/java/cn/axzo/workflow/server/controller/web/bpmn/BpmnProcessTaskController.java
+++ b/workflow-engine-server/src/main/java/cn/axzo/workflow/server/controller/web/bpmn/BpmnProcessTaskController.java
@@ -126,7 +126,7 @@ public class BpmnProcessTaskController implements ProcessTaskApi {
     @PostMapping("/back")
     @RepeatSubmit
     @Override
-    public CommonResponse<Boolean> backTask(BpmnTaskBackAuditDTO dto) {
+    public CommonResponse<Boolean> backTask(@Validated @RequestBody BpmnTaskBackAuditDTO dto) {
         bpmnProcessTaskService.backTask(dto);
         return success();
     }