diff --git a/backend/services/admin-service/src/infrastructure/persistence/repositories/user-detail-query.repository.impl.ts b/backend/services/admin-service/src/infrastructure/persistence/repositories/user-detail-query.repository.impl.ts
index ab4f252e..b4786e84 100644
--- a/backend/services/admin-service/src/infrastructure/persistence/repositories/user-detail-query.repository.impl.ts
+++ b/backend/services/admin-service/src/infrastructure/persistence/repositories/user-detail-query.repository.impl.ts
@@ -102,7 +102,11 @@ export class UserDetailQueryRepositoryImpl implements IUserDetailQueryRepository
     ]);
 
     const adoptionCountMap = new Map(adoptionCounts.map(a => [a.accountSequence, a._count.id]));
-    const directCountMap = new Map(directReferralCounts.map(d => [d.referrerId.toString(), d._count.userId]));
+    const directCountMap = new Map(
+      directReferralCounts
+        .filter(d => d.referrerId !== null)
+        .map(d => [d.referrerId!.toString(), d._count.userId])
+    );
 
     // 合并数据
     const referralMap = new Map(referrals.map((r) => [r.userId.toString(), r]));
@@ -175,7 +179,11 @@ export class UserDetailQueryRepositoryImpl implements IUserDetailQueryRepository
     ]);
 
     const adoptionCountMap = new Map(adoptionCounts.map(a => [a.accountSequence, a._count.id]));
-    const directCountMap = new Map(directReferralCounts.map(d => [d.referrerId.toString(), d._count.userId]));
+    const directCountMap = new Map(
+      directReferralCounts
+        .filter(d => d.referrerId !== null)
+        .map(d => [d.referrerId!.toString(), d._count.userId])
+    );
     const userMap = new Map(users.map((u) => [u.userId.toString(), u]));
 
     return directReferrals.map((ref) => {