diff --git a/workflow-engine-server/src/main/java/cn/axzo/workflow/server/controller/delegate/AbstractBpmnTaskAssigneeSelector.java b/workflow-engine-server/src/main/java/cn/axzo/workflow/server/controller/delegate/AbstractBpmnTaskAssigneeSelector.java
index 808422ece..cc4870b06 100644
--- a/workflow-engine-server/src/main/java/cn/axzo/workflow/server/controller/delegate/AbstractBpmnTaskAssigneeSelector.java
+++ b/workflow-engine-server/src/main/java/cn/axzo/workflow/server/controller/delegate/AbstractBpmnTaskAssigneeSelector.java
@@ -81,7 +81,7 @@ public abstract class AbstractBpmnTaskAssigneeSelector implements BpmnTaskAssign
         Assert.notNull(result, "服务调用异常");
         // 200自定义处理
         if (HttpStatus.HTTP_OK != result.getCode()) {
-            throw new WorkflowEngineException(CALC_TASK_ASSIGNEE_ERROR, result.getMsg());
+            throw new WorkflowEngineException(CALC_TASK_ASSIGNEE_ERROR, "[API:]" + result.getMsg());
         }
         return result.getData();
     }
diff --git a/workflow-engine-server/src/main/java/cn/axzo/workflow/server/controller/delegate/AdminTaskAssigneeSelector.java b/workflow-engine-server/src/main/java/cn/axzo/workflow/server/controller/delegate/AdminTaskAssigneeSelector.java
index 6e09fcc58..38bf53ebd 100644
--- a/workflow-engine-server/src/main/java/cn/axzo/workflow/server/controller/delegate/AdminTaskAssigneeSelector.java
+++ b/workflow-engine-server/src/main/java/cn/axzo/workflow/server/controller/delegate/AdminTaskAssigneeSelector.java
@@ -16,7 +16,6 @@ import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Component;
 import org.springframework.util.CollectionUtils;
 
-import java.util.Collections;
 import java.util.List;
 import java.util.stream.Collectors;
 
@@ -69,7 +68,7 @@ public class AdminTaskAssigneeSelector extends AbstractBpmnTaskAssigneeSelector
                         "通过管理员查询审批人", req);
 
         if (CollUtil.isEmpty(flowTaskAssigners)) {
-            return Collections.emptyList();
+            return super.invokeService(userTask, execution, scopeDto);
         }
         return BeanUtil.copyToList(flowTaskAssigners, BpmnTaskDelegateAssigner.class);
     }
diff --git a/workflow-engine-server/src/main/java/cn/axzo/workflow/server/controller/delegate/PositionTaskAssigneeSelector.java b/workflow-engine-server/src/main/java/cn/axzo/workflow/server/controller/delegate/PositionTaskAssigneeSelector.java
index 7507670ea..ea6dba68f 100644
--- a/workflow-engine-server/src/main/java/cn/axzo/workflow/server/controller/delegate/PositionTaskAssigneeSelector.java
+++ b/workflow-engine-server/src/main/java/cn/axzo/workflow/server/controller/delegate/PositionTaskAssigneeSelector.java
@@ -15,7 +15,6 @@ import org.flowable.engine.delegate.DelegateExecution;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Component;
 
-import java.util.Collections;
 import java.util.List;
 import java.util.stream.Collectors;
 
@@ -63,7 +62,7 @@ public class PositionTaskAssigneeSelector extends AbstractBpmnTaskAssigneeSelect
                         "审批节点: " + userTask.getId() + ", 通过岗位查询审批人", req);
 
         if (CollUtil.isEmpty(flowTaskAssigners)) {
-            return Collections.emptyList();
+            return super.invokeService(userTask, execution, scopeDto);
         }
         return BeanUtil.copyToList(flowTaskAssigners, BpmnTaskDelegateAssigner.class);
     }
diff --git a/workflow-engine-server/src/main/java/cn/axzo/workflow/server/controller/delegate/RoleTaskAssigneeSelector.java b/workflow-engine-server/src/main/java/cn/axzo/workflow/server/controller/delegate/RoleTaskAssigneeSelector.java
index 230d2154c..b1c40426e 100644
--- a/workflow-engine-server/src/main/java/cn/axzo/workflow/server/controller/delegate/RoleTaskAssigneeSelector.java
+++ b/workflow-engine-server/src/main/java/cn/axzo/workflow/server/controller/delegate/RoleTaskAssigneeSelector.java
@@ -15,7 +15,6 @@ import org.flowable.engine.delegate.DelegateExecution;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Component;
 
-import java.util.Collections;
 import java.util.List;
 import java.util.Set;
 import java.util.stream.Collectors;
@@ -70,7 +69,7 @@ public class RoleTaskAssigneeSelector extends AbstractBpmnTaskAssigneeSelector {
                 .collect(Collectors.toList());
 
         if (CollUtil.isEmpty(flowTaskAssigners)) {
-            return Collections.emptyList();
+            return super.invokeService(userTask, execution, scopeDto);
         }
         return flowTaskAssigners.stream().map(u -> BpmnTaskDelegateAssigner.builder()
                         .assignee(String.valueOf(u.getIdentityId()))