diff --git a/workflow-engine-server/src/main/java/cn/axzo/workflow/server/controller/delegate/BasedRoleTaskAssigneeSelector.java b/workflow-engine-server/src/main/java/cn/axzo/workflow/server/controller/delegate/BasedRoleTaskAssigneeSelector.java
index f05d1b81b..cba156eba 100644
--- a/workflow-engine-server/src/main/java/cn/axzo/workflow/server/controller/delegate/BasedRoleTaskAssigneeSelector.java
+++ b/workflow-engine-server/src/main/java/cn/axzo/workflow/server/controller/delegate/BasedRoleTaskAssigneeSelector.java
@@ -16,7 +16,9 @@ import org.flowable.bpmn.model.FlowElement;
 import org.flowable.engine.delegate.DelegateExecution;
 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.Map;
 import java.util.Objects;
@@ -69,7 +71,7 @@ public class BasedRoleTaskAssigneeSelector extends AbstractBpmnTaskAssigneeSelec
         ListFlowTaskAssignerReq req = ListFlowTaskAssignerReq.builder()
                 .procInstId(execution.getProcessInstanceId())
                 .procInstType(Integer.valueOf(Objects.requireNonNull(categoryItemVO.map(CategoryItemVO::getWorkspaceTypeCode).orElse(null))))
-                .orgScopes(scopeDto.getOrgScopes().stream()
+                .orgScopes(CollectionUtils.isEmpty(scopeDto.getOrgScopes()) ? Collections.emptyList() : scopeDto.getOrgScopes().stream()
                         .map(os -> ListFlowTaskAssignerReq.OrgScope.builder()
                                 .ouId(os.getOuId())
                                 .nodeId(os.getNodeId())
@@ -77,7 +79,7 @@ public class BasedRoleTaskAssigneeSelector extends AbstractBpmnTaskAssigneeSelec
                                 .workspaceType(os.getWorkspaceType())
                                 .build())
                         .collect(Collectors.toList()))
-                .workerTeamScopes(scopeDto.getWorkerTeamScopes().stream()
+                .workerTeamScopes(CollectionUtils.isEmpty(scopeDto.getWorkerTeamScopes()) ? Collections.emptyList() : scopeDto.getWorkerTeamScopes().stream()
                         .map(ot -> ListFlowTaskAssignerReq.OrgScope.builder()
                                 .workspaceId(ot.getWorkspaceId())
                                 .ouId(ot.getOuId())