diff --git a/pkg/user/tx_client.go b/pkg/user/tx_client.go
index 7897f0e578..1d546d8185 100644
--- a/pkg/user/tx_client.go
+++ b/pkg/user/tx_client.go
@@ -125,6 +125,7 @@ func NewTxClient(
 	}
 
 	txClient := &TxClient{
+		mtx:             sync.Mutex{},
 		signer:          signer,
 		registry:        registry,
 		grpc:            conn,