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 e8d9717c..4f0337b6 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
@@ -351,7 +351,10 @@ public class ActTaskService extends BaseServiceImpl {
                         StringBuilder stringBuilder = new StringBuilder();
                         List<String> proviDeptsName = resourceDao.selectProvideDeptNameByIds(resourceIds);
                         proviDeptsName.forEach(x -> stringBuilder.append(x).append(","));
-                        String string = stringBuilder.substring(0, stringBuilder.length() - 1);
+                        String string = "";
+                        if (stringBuilder.length() > 0) {
+                            string = stringBuilder.substring(0, stringBuilder.length() - 1);
+                        }
                         dto.setProvideDept(string);
                     }, executor);