diff --git a/internal/iplibrary/ip2Region.go b/internal/iplibrary/ip2Region.go
index f6b1521..cbb77aa 100644
--- a/internal/iplibrary/ip2Region.go
+++ b/internal/iplibrary/ip2Region.go
@@ -99,7 +99,7 @@ func (this *IP2Region) MemorySearch(ipStr string) (ipInfo *IpInfo, err error) {
 		}
 	}
 	if dataPtr == 0 {
-		return nil, errors.New("not found")
+		return nil, nil
 	}
 
 	dataLen := (dataPtr >> 24) & 0xFF