diff --git a/source/_posts/shiro-spring.md b/source/_posts/shiro-spring.md
index 0865405..8f85b49 100644
--- a/source/_posts/shiro-spring.md
+++ b/source/_posts/shiro-spring.md
@@ -343,7 +343,7 @@ public class UsernameRealm extends AuthoringRealm {
     var token = (UsernamePasswordToken) authenticationToken;
     return memberRepository.findMemberByUsername((String) token.getPrincipal())
           .map(member -> new SimpleAuthenticationInfo(member, member.getPassword(), member.getFulLName()))
-          .orElse(null);
+          .orElseThrow(() -> new AuthenticationException("用户不存在。"));
   }
 }
 ```
@@ -407,7 +407,7 @@ public class TokenRealm extends AuthorizingRealm {
     return storeRepository.findTokenById(token.getToken())
           .filter(t -> t.getExpires().isAfter(LocalDateTime.now()))
           .map(t -> new SimpleAuthenticationInfo(t.getMember(), t.getToken(), t.getMember().getFulLName()))
-          .orElse(null);
+          .orElseThrow(() -> new AuthenticationException("用户令牌不存在。"));
   }
 }
 ```