diff --git a/src/main/entry/org/bdware/sc/bean/Contract.java b/src/main/entry/org/bdware/sc/bean/Contract.java
index b79e35a..7536681 100644
--- a/src/main/entry/org/bdware/sc/bean/Contract.java
+++ b/src/main/entry/org/bdware/sc/bean/Contract.java
@@ -233,6 +233,8 @@ public class Contract extends SM2Verifiable implements Serializable {
     }
 
     public JsonElement getCreateParam() {
-        return createParam.getJsonElement();
+        if (createParam != null)
+            return createParam.getJsonElement();
+        return null;
     }
 }