diff --git a/workflow-engine-core/src/main/java/cn/axzo/workflow/core/engine/cmd/CustomTransferUserTaskCmd.java b/workflow-engine-core/src/main/java/cn/axzo/workflow/core/engine/cmd/CustomTransferUserTaskCmd.java
index 6d370a2be..96f002ecf 100644
--- a/workflow-engine-core/src/main/java/cn/axzo/workflow/core/engine/cmd/CustomTransferUserTaskCmd.java
+++ b/workflow-engine-core/src/main/java/cn/axzo/workflow/core/engine/cmd/CustomTransferUserTaskCmd.java
@@ -29,6 +29,7 @@ import java.util.List;
 import java.util.Map;
 import java.util.Objects;
 
+import static cn.axzo.workflow.common.code.BpmnTaskRespCode.TASK_HAS_BEEN_COMPLETE;
 import static cn.axzo.workflow.common.code.BpmnTaskRespCode.TRANSFER_TO_SELF;
 import static cn.axzo.workflow.common.code.OtherRespCode.ASSIGNEE_NODE_ID_NOT_EXISTS;
 import static cn.axzo.workflow.common.constant.BpmnConstants.COMMENT_TYPE_ADVICE;
@@ -100,6 +101,9 @@ public class CustomTransferUserTaskCmd extends AbstractCommand<Void> implements
 
         TaskService taskService = processEngineConfiguration.getTaskService();
         TaskEntity task = (TaskEntity) taskService.createTaskQuery().taskId(originTaskId).singleResult();
+        if (Objects.isNull(task)) {
+            throw new WorkflowEngineException(TASK_HAS_BEEN_COMPLETE);
+        }
 
         validTargetAssigneeNodeId(task.getProcessDefinitionId());