修复 匿名用户会被鉴定为anonymousUser

src/main/java/cn/iocoder/dashboard/framework/security/core/util/SecurityFrameworkUtils.java

@@ -20,7 +20,8 @@ import java.util.Set;
  */
 public class SecurityFrameworkUtils {
 
-    private SecurityFrameworkUtils() {}
+    private SecurityFrameworkUtils() {
+    }
 
     /**
      * 从请求中，获得认证 Token
@@ -56,7 +57,7 @@ public class SecurityFrameworkUtils {
         if (authentication == null) {
             return null;
         }
-        return (LoginUser) authentication.getPrincipal();
+        return authentication.getPrincipal() instanceof LoginUser ? (LoginUser) authentication.getPrincipal() : null;
     }
 
     /**