From c9bbd9fa7a103fa79de7e5b7ad3b3dc922f894fb Mon Sep 17 00:00:00 2001
From: wubin01 <wb_bupt@163.com>
Date: Mon, 2 Aug 2021 18:30:28 +0800
Subject: [PATCH] modify process SyncBlockChain  message

---
 .../core/net/messagehandler/SyncBlockChainMsgHandler.java  | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/framework/src/main/java/org/tron/core/net/messagehandler/SyncBlockChainMsgHandler.java b/framework/src/main/java/org/tron/core/net/messagehandler/SyncBlockChainMsgHandler.java
index f751064d97e..65702c435f8 100644
--- a/framework/src/main/java/org/tron/core/net/messagehandler/SyncBlockChainMsgHandler.java
+++ b/framework/src/main/java/org/tron/core/net/messagehandler/SyncBlockChainMsgHandler.java
@@ -15,6 +15,7 @@
 import org.tron.core.net.message.SyncBlockChainMessage;
 import org.tron.core.net.message.TronMessage;
 import org.tron.core.net.peer.PeerConnection;
+import org.tron.protos.Protocol;
 
 @Slf4j(topic = "net")
 @Component
@@ -36,7 +37,11 @@ public void processMessage(PeerConnection peer, TronMessage msg) throws P2pExcep
 
     LinkedList<BlockId> blockIds = getLostBlockIds(summaryChainIds);
 
-    if (blockIds.size() == 1) {
+    if (blockIds.size() == 0) {
+      logger.error("Can't get lost block Ids.");
+      peer.disconnect(Protocol.ReasonCode.INCOMPATIBLE_CHAIN);
+      return;
+    } else if (blockIds.size() == 1) {
       peer.setNeedSyncFromUs(false);
     } else {
       peer.setNeedSyncFromUs(true);