diff --git a/workflow-engine-core/src/main/java/cn/axzo/workflow/core/service/impl/BpmnProcessInstanceServiceImpl.java b/workflow-engine-core/src/main/java/cn/axzo/workflow/core/service/impl/BpmnProcessInstanceServiceImpl.java
index 4dc5eaf92..f2f939a33 100644
--- a/workflow-engine-core/src/main/java/cn/axzo/workflow/core/service/impl/BpmnProcessInstanceServiceImpl.java
+++ b/workflow-engine-core/src/main/java/cn/axzo/workflow/core/service/impl/BpmnProcessInstanceServiceImpl.java
@@ -1140,7 +1140,7 @@ public class BpmnProcessInstanceServiceImpl implements BpmnProcessInstanceServic
             // 比对抄送人
             logVO.getTaskDetails().stream()
                 .filter(i -> Objects.equals(i.getNodeType(), NODE_CARBON_COPY))
-                .flatMap(i -> i.getForecastAssignees().stream())
+                .flatMap(i -> ListUtils.emptyIfNull(i.getForecastAssignees()).stream())
                 .filter(i -> i.buildAssigneeId().contains(ge130Assignee) || Objects.equals(i.buildAssigneeId_1_2_1(), le130Assignee))
                 .findAny()
                 .ifPresent(i -> authorizedButtons.addAll(chooseButtons(logVO, CONFIG_BUTTON_TYPE_CARBON_COPY)));
@@ -1210,9 +1210,19 @@ public class BpmnProcessInstanceServiceImpl implements BpmnProcessInstanceServic
         getFutureTasks(forecasting, tasks);
         // 处理是否加密
         handleEncrypt(dto.getEncrypt(), tasks);
+        // reset field forecastAssignees Empty to null;
+        resetCollectionToNull(tasks);
         return tasks;
     }
 
+    private void resetCollectionToNull(List<BpmnTaskInstanceLogVO> tasks) {
+        tasks.forEach(i-> {
+            if(ListUtils.emptyIfNull(i.getForecastAssignees()).isEmpty()) {
+                i.setForecastAssignees(null);
+            }
+        });
+    }
+
     private static void handleEncrypt(Boolean encrypt, List<BpmnTaskInstanceLogVO> tasks) {
         if (Boolean.FALSE.equals(encrypt)) {
             return;
@@ -1230,7 +1240,7 @@ public class BpmnProcessInstanceServiceImpl implements BpmnProcessInstanceServic
                 i.setOperationDesc("已处理");
             }
             // 统一将多人节点数据全部置空
-            i.setForecastAssignees(Collections.emptyList());
+            i.setForecastAssignees(null);
             // 统一将签名数据置空
             i.setSignatureUrl(null);
         });