diff --git a/renren-admin/src/main/java/io/renren/modules/activiti/controller/ActTaskController.java b/renren-admin/src/main/java/io/renren/modules/activiti/controller/ActTaskController.java
index e18b7c7e..43d32427 100644
--- a/renren-admin/src/main/java/io/renren/modules/activiti/controller/ActTaskController.java
+++ b/renren-admin/src/main/java/io/renren/modules/activiti/controller/ActTaskController.java
@@ -201,7 +201,7 @@ public class ActTaskController {
                         .map(index_ -> index_.getMember())
                         .filter(Objects::nonNull)
                         .flatMap(index_ -> index_.stream())
-                        .map(index_ -> (String) index_.get("id"))
+                        .map(index_ -> index_.get("id").toString())
                         .filter(index_ -> !userId.equals(index_)) // 过滤非本人
                         .distinct()
                         .collect(Collectors.toList());
diff --git a/renren-admin/src/main/java/io/renren/modules/activiti/service/ActTaskService.java b/renren-admin/src/main/java/io/renren/modules/activiti/service/ActTaskService.java
index 1c96b7a6..e6b022c1 100644
--- a/renren-admin/src/main/java/io/renren/modules/activiti/service/ActTaskService.java
+++ b/renren-admin/src/main/java/io/renren/modules/activiti/service/ActTaskService.java
@@ -153,7 +153,7 @@ public class ActTaskService extends BaseServiceImpl {
                     .filter(Objects::nonNull)
                     .filter(index -> !index.isEmpty())
                     .flatMap(index -> index.stream())
-                    .map(index -> (String) index.get("id"))
+                    .map(index -> index.get("id").toString())
                     .filter(index -> !userId.equals(index)) // 过滤非本人
                     .distinct()
                     .collect(Collectors.toList());