diff --git a/jeecg-boot/jeecg-boot-module-system/src/main/java/org/jeecg/modules/task/controller/TaskController.java b/jeecg-boot/jeecg-boot-module-system/src/main/java/org/jeecg/modules/task/controller/TaskController.java
index 28b30e7..ec843ed 100644
--- a/jeecg-boot/jeecg-boot-module-system/src/main/java/org/jeecg/modules/task/controller/TaskController.java
+++ b/jeecg-boot/jeecg-boot-module-system/src/main/java/org/jeecg/modules/task/controller/TaskController.java
@@ -258,7 +258,9 @@ public class TaskController extends JeecgController<Task, ITaskService> {
 
                         avatars.append(byId.getAvatar()).append(",");
                 }
-                avatars = new StringBuilder(avatars.substring(0, avatars.length() - 1));
+                if (avatars.length() != 0) {
+                    avatars = new StringBuilder(avatars.substring(0, avatars.length() - 1));
+                }
                 e.setHeadpic(avatars.toString());
             }