diff --git a/physical-module-system/physical-system-biz/src/main/java/org/jeecg/modules/database/controller/ExperimentController.java b/physical-module-system/physical-system-biz/src/main/java/org/jeecg/modules/database/controller/ExperimentController.java
index 315fc8d..d9b031f 100644
--- a/physical-module-system/physical-system-biz/src/main/java/org/jeecg/modules/database/controller/ExperimentController.java
+++ b/physical-module-system/physical-system-biz/src/main/java/org/jeecg/modules/database/controller/ExperimentController.java
@@ -90,9 +90,11 @@ public class ExperimentController extends JeecgController<Experiment, IExperimen
             if (CollUtil.isNotEmpty(user)) {
                 List<ExperimentUserDTO> list = new ArrayList<>();
                 for (ExperimentUser experimentUser : user) {
-                    SysUser sysUser = userService.getById(experimentUser.getUserId());
                     ExperimentUserDTO userDTO = ExperimentUserDTO.of(experimentUser);
-                    userDTO.setUserName(sysUser.getRealname());
+                    SysUser sysUser = userService.getById(experimentUser.getUserId());
+                    if (Objects.nonNull(user)) {
+                        userDTO.setUserName(sysUser.getRealname());
+                    }
                     list.add(userDTO);
                 }
                 userDTOList = list;