diff --git a/cmd/assetCollectionService/go.mod b/cmd/assetCollectionService/go.mod
index 3fb50c820..790dd01ff 100644
--- a/cmd/assetCollectionService/go.mod
+++ b/cmd/assetCollectionService/go.mod
@@ -3,7 +3,7 @@ module github.com/diadata-org/diadata/assetCollectionService
 go 1.20
 
 require (
-	github.com/diadata-org/diadata v1.4.543
+	github.com/diadata-org/diadata v1.4.544
 	github.com/sirupsen/logrus v1.9.3
 )
 
diff --git a/pkg/dia/service/assetservice/source/bitflow.go b/pkg/dia/service/assetservice/source/bitflow.go
index 0e1628bfd..03917ead8 100644
--- a/pkg/dia/service/assetservice/source/bitflow.go
+++ b/pkg/dia/service/assetservice/source/bitflow.go
@@ -70,7 +70,7 @@ func (s *BitflowAssetSource) fetchAssets() {
 	}
 
 	for _, token := range tokens {
-		if token.Symbol == "STX" {
+		if token.Symbol == "STX" && token.TokenContract == "null" {
 			token.TokenContract = "0x0000000000000000000000000000000000000000"
 		}
 		s.assetChannel <- dia.Asset{