From e11d151b554d8c4f8b72384309b0ccd59a5f91c7 Mon Sep 17 00:00:00 2001
From: CaiHQ <caihq@pku.edu.cn>
Date: Mon, 1 Nov 2021 17:31:35 +0800
Subject: [PATCH] prune: delete ResultBack

---
 .../java/org/bdware/sc/event/clients/ContractConsumer.java     | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/main/java/org/bdware/sc/event/clients/ContractConsumer.java b/src/main/java/org/bdware/sc/event/clients/ContractConsumer.java
index 2d6642f..cfff548 100644
--- a/src/main/java/org/bdware/sc/event/clients/ContractConsumer.java
+++ b/src/main/java/org/bdware/sc/event/clients/ContractConsumer.java
@@ -88,7 +88,8 @@ public class ContractConsumer implements IEventConsumer {
                         try {
                             ContractResult result = JsonUtil.fromJson(str, ContractResult.class);
                             if (result.status == ContractResult.Status.Success) {
-                                rc.onResult(null);
+                                String retStr = null;
+                                rc.onResult(retStr);
                             } else if (callCount.get() == TIMEOUT_COUNT ||
                                     (result.status == ContractResult.Status.Exception &&
                                             result.result.toString().contains("not exported"))) {