diff --git a/build.gradle b/build.gradle
index 5e107ef..8b9eb99 100644
--- a/build.gradle
+++ b/build.gradle
@@ -5,7 +5,7 @@ plugins {
     id 'signing'
 }
 group 'org.bdware.bdcontract'
-version '1.0.0'
+version '1.0.1'
 sourceCompatibility = 1.8
 
 
diff --git a/src/main/sdk/org/bdware/client/SmartContractHttpClient.java b/src/main/sdk/org/bdware/client/SmartContractHttpClient.java
index 4063b61..f05b9a5 100644
--- a/src/main/sdk/org/bdware/client/SmartContractHttpClient.java
+++ b/src/main/sdk/org/bdware/client/SmartContractHttpClient.java
@@ -32,13 +32,18 @@ public class SmartContractHttpClient {
 
     public static String getExecuteUrl(String ip, int port, ContractRequest cr) {
         try {
+            String str;
+            if (cr.getArg() == null) str = "";
+            else if (cr.getArg().isJsonPrimitive())
+                str = cr.getArg().getAsString();
+            else str = cr.getArg().toString();
             return String.format(
                     "http://%s:%d/SCIDE/CMManager?action=executeContract&contractID=%s&operation=%s&arg=%s&pubkey=%s&signature=%s",
                     ip,
                     port,
                     cr.getContractID(),
                     cr.getAction(),
-                    URLEncoder.encode(cr.getArg().toString(), "utf-8"),
+                    URLEncoder.encode(str, "utf-8"),
                     cr.getPublicKey(),
                     cr.signature);
         } catch (UnsupportedEncodingException e) {