diff --git a/nft.go b/nft.go
index d855944..33637aa 100644
--- a/nft.go
+++ b/nft.go
@@ -207,12 +207,7 @@ func (s *MarketService) GetNft(ctx context.Context, collection string, tokenId i
 	res.IsRecent = time.Unix(res.UpdatedAt, 0).After(time.Now().Add(-1 * time.Hour))
 	res.IsVeryRecent = time.Unix(res.UpdatedAt, 0).After(time.Now().Add(-5 * time.Minute))
 	res.IsNotMine = res.CurrentSeller != s.bscaddress
-
-	if n, err := s.profileService.GetUsername(res.CurrentSeller); err != nil {
-		res.CurrentSellerUsername = res.CurrentSeller
-	} else {
-		res.CurrentSellerUsername = n
-	}
+	res.CurrentSellerUsername = s.profileService.GetUsername(res.CurrentSeller)
 
 	return res, nil
 }
@@ -274,11 +269,7 @@ func (s *MarketService) getPage(ctx context.Context, collection string, pagenum
 			floor = nft.CurrentAskPrice
 		}
 		nft.IsNotMine = nft.CurrentSeller != s.bscaddress
-		if n, err := s.profileService.GetUsername(nft.CurrentSeller); err != nil {
-			nft.CurrentSellerUsername = nft.CurrentSeller
-		} else {
-			nft.CurrentSellerUsername = n
-		}
+		nft.CurrentSellerUsername = s.profileService.GetUsername(nft.CurrentSeller)
 		res = append(res, nft)
 	}
 
diff --git a/profile.go b/profile.go
index 457e9ff..f4ae0dc 100644
--- a/profile.go
+++ b/profile.go
@@ -52,18 +52,17 @@ func NewProfileService() *ProfileService {
 	}
 }
 
-func (s *ProfileService) GetUsername(address string) (string, error) {
+func (s *ProfileService) GetUsername(address string) string {
 	s.lock.Lock()
 	defer s.lock.Unlock()
 	if name, ok := s.cache[address]; ok {
-		return name, nil
+		return name
+	}
+	if name, err := getUsernameFromAddress(address); err != nil {
+		s.cache[address] = address
+	} else {
+		s.cache[address] = name
 	}
 
-	name, err := getUsernameFromAddress(address)
-	if err != nil {
-		return "", err
-	}
-	s.cache[address] = name
-
-	return name, nil
+	return s.cache[address]
 }
diff --git a/transaction.go b/transaction.go
index 7a43c5f..3b973fe 100644
--- a/transaction.go
+++ b/transaction.go
@@ -110,16 +110,8 @@ func (s *TransactionService) GetLightPageByLimit(ctx context.Context, pagenumber
 			return transaction.Nft.TransactionHistory[i].Timestamp > transaction.Nft.TransactionHistory[j].Timestamp
 		})
 		transaction.IsMine = transaction.Buyer.Address == s.bscaddress || transaction.Seller.Address == s.bscaddress
-		if n, err := s.profileService.GetUsername(transaction.Seller.Address); err != nil {
-			transaction.SellerUsername = transaction.Seller.Address
-		} else {
-			transaction.SellerUsername = n
-		}
-		if n, err := s.profileService.GetUsername(transaction.Buyer.Address); err != nil {
-			transaction.BuyerUsername = transaction.Buyer.Address
-		} else {
-			transaction.BuyerUsername = n
-		}
+		transaction.SellerUsername = s.profileService.GetUsername(transaction.Seller.Address)
+		transaction.BuyerUsername = s.profileService.GetUsername(transaction.Buyer.Address)
 	}
 
 	var res []Transaction
@@ -179,16 +171,8 @@ func (s *TransactionService) GetPageByLimit(ctx context.Context, pagenumber int,
 
 		transaction.Time = time.Unix(transaction.Timestamp, 0)
 		transaction.TimeDescription = humanize.Time(transaction.Time)
-		if n, err := s.profileService.GetUsername(transaction.Seller.Address); err != nil {
-			transaction.SellerUsername = transaction.Seller.Address
-		} else {
-			transaction.SellerUsername = n
-		}
-		if n, err := s.profileService.GetUsername(transaction.Buyer.Address); err != nil {
-			transaction.BuyerUsername = transaction.Buyer.Address
-		} else {
-			transaction.BuyerUsername = n
-		}
+		transaction.SellerUsername = s.profileService.GetUsername(transaction.Seller.Address)
+		transaction.BuyerUsername = s.profileService.GetUsername(transaction.Buyer.Address)
 	}
 
 	var res []Transaction