diff --git a/ruoyi-modules/ruoyi-workflow/src/main/java/org/dromara/workflow/utils/WorkflowUtils.java b/ruoyi-modules/ruoyi-workflow/src/main/java/org/dromara/workflow/utils/WorkflowUtils.java
index 6e78770d4..11f3e7ae0 100644
--- a/ruoyi-modules/ruoyi-workflow/src/main/java/org/dromara/workflow/utils/WorkflowUtils.java
+++ b/ruoyi-modules/ruoyi-workflow/src/main/java/org/dromara/workflow/utils/WorkflowUtils.java
@@ -40,7 +40,8 @@ public class WorkflowUtils {
                     .map(role -> TaskAssigneeEnum.ROLE.getCode() + role.getRoleId()),
 
                 // 岗位权限前缀
-                loginUser.getPosts().stream()
+                Stream.ofNullable(loginUser.getPosts())
+                    .flatMap(Collection::stream)
                     .map(post -> TaskAssigneeEnum.POST.getCode() + post.getPostId()),
 
                 // 用户和部门权限