diff --git a/src/neo/Wallets/Wallet.cs b/src/neo/Wallets/Wallet.cs
index 75dc069768..614688f768 100644
--- a/src/neo/Wallets/Wallet.cs
+++ b/src/neo/Wallets/Wallet.cs
@@ -350,7 +350,7 @@ private Transaction MakeTransaction(StoreView snapshot, byte[] script, Signer[]
                 {
                     if (engine.State == VMState.FAULT)
                     {
-                        throw new InvalidOperationException($"Failed execution for '{script.ToHexString()}'", engine.FaultException);
+                        throw new InvalidOperationException($"Failed execution for '{Convert.ToBase64String(script)}'", engine.FaultException);
                     }
                     tx.SystemFee = engine.GasConsumed;
                 }