diff --git a/src/main/java/com/gxwebsoft/common/system/controller/MainController.java b/src/main/java/com/gxwebsoft/common/system/controller/MainController.java
index a01a2b5..0bb4dbb 100644
--- a/src/main/java/com/gxwebsoft/common/system/controller/MainController.java
+++ b/src/main/java/com/gxwebsoft/common/system/controller/MainController.java
@@ -626,7 +626,8 @@ public class MainController extends BaseController {
     String password = user.getPassword();          // 密码
     String code = user.getCode();                  // 短信验证码
     String email = user.getEmail();                // 邮箱
-    final Boolean isAdmin = user.getIsSuperAdmin();     // 是否注册为超级管理员(是=>创建租户)
+    // Treat null as false to avoid NPE when unboxing Boolean in conditions.
+    final boolean isAdmin = Boolean.TRUE.equals(user.getIsSuperAdmin());     // 是否注册为超级管理员(是=>创建租户)
 
     if (!isAdmin) {
       // 短信验证
@@ -784,7 +785,8 @@ public class MainController extends BaseController {
     String password = user.getPassword();          // 密码
     String code = user.getCode();                  // 短信验证码
     String email = user.getEmail();                // 邮箱
-    final Boolean isAdmin = user.getIsSuperAdmin();     // 是否注册为超级管理员(是=>创建租户)
+    // Treat null as false to avoid NPE when unboxing Boolean in conditions.
+    final boolean isAdmin = Boolean.TRUE.equals(user.getIsSuperAdmin());     // 是否注册为超级管理员(是=>创建租户)
 
     // 会员资料
     final UserParam userParam = new UserParam();