diff --git a/src/main/entry/org/bdware/sc/bean/ContractRequest.java b/src/main/entry/org/bdware/sc/bean/ContractRequest.java
index 1f02d5f..a626ed7 100644
--- a/src/main/entry/org/bdware/sc/bean/ContractRequest.java
+++ b/src/main/entry/org/bdware/sc/bean/ContractRequest.java
@@ -138,7 +138,7 @@ public class ContractRequest extends SM2Verifiable
                 "%s|%s|%s%s|%s",
                 (contractDOI != null && contractDOI.length() > 0) ? contractDOI : contractID,
                 action,
-                arg,
+                arg.getAsString(),
                 gasLimit > 0 ? "|" + gasLimit : "",
                 requester);
     }