diff --git a/source/libs/sync/src/syncAppendEntriesReply.c b/source/libs/sync/src/syncAppendEntriesReply.c
index 875204c0a9..13ea250155 100644
--- a/source/libs/sync/src/syncAppendEntriesReply.c
+++ b/source/libs/sync/src/syncAppendEntriesReply.c
@@ -83,10 +83,14 @@ int32_t syncNodeOnAppendEntriesReply(SSyncNode* ths, const SRpcMsg* pRpcMsg) {
     ASSERT(pState != NULL);
 
     if (pMsg->lastSendIndex == pState->lastSendIndex) {
+      int64_t timeNow = taosGetTimestampMs();
+      int64_t elapsed = timeNow - pState->lastSendTime;
+      sNTrace(ths, "sync-append-entries rtt elapsed:%" PRId64 ", index:%" PRId64, elapsed, pState->lastSendIndex);
+
       syncNodeReplicateOne(ths, &(pMsg->srcId), true);
     }
   }
 
   syncLogRecvAppendEntriesReply(ths, pMsg, "process");
   return 0;
-}
\ No newline at end of file
+}
diff --git a/source/libs/sync/src/syncSnapshot.c b/source/libs/sync/src/syncSnapshot.c
index 9bc0a07d48..222b7c4e1e 100644
--- a/source/libs/sync/src/syncSnapshot.c
+++ b/source/libs/sync/src/syncSnapshot.c
@@ -192,7 +192,9 @@ int32_t snapshotSend(SSyncSnapshotSender *pSender) {
 
   // pMsg->privateTerm = pSender->privateTerm;
 
-  memcpy(pMsg->data, pSender->pCurrentBlock, pSender->blockLen);
+  if (pSender->pCurrentBlock != NULL) {
+    memcpy(pMsg->data, pSender->pCurrentBlock, pSender->blockLen);
+  }
 
   // send msg
   syncNodeSendMsgById(&pMsg->destId, pSender->pSyncNode, &rpcMsg);