diff --git a/src/main/java/ru/soune/nocopy/service/referral/ReferralRepoImpl.java b/src/main/java/ru/soune/nocopy/service/referral/ReferralRepoImpl.java
index 7cf192c..59f67db 100644
--- a/src/main/java/ru/soune/nocopy/service/referral/ReferralRepoImpl.java
+++ b/src/main/java/ru/soune/nocopy/service/referral/ReferralRepoImpl.java
@@ -66,7 +66,7 @@ public class ReferralRepoImpl implements ReferralRepo {
     @Override
     public @Nullable Long getInviterIdForUser(long userId) {
         ru.soune.nocopy.entity.referral.Referral referral  = referralRepository.findByUserId(userId);
-        return referral != null ? referral.getInviterId() : 0L;
+        return referral != null ? referral.getInviterId() : null;
     }
 
     @Override