From 7395189f59b985760b9ad5b73b5c6efce8793915 Mon Sep 17 00:00:00 2001
From: qicosmos <qicosmos@163.com>
Date: Wed, 24 Jul 2019 16:56:51 +0800
Subject: [PATCH] add a check for empty outbpx

---
 include/rpc_client.hpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/rpc_client.hpp b/include/rpc_client.hpp
index 02bff43..557eba8 100644
--- a/include/rpc_client.hpp
+++ b/include/rpc_client.hpp
@@ -337,6 +337,10 @@ namespace rest_rpc {
 				}
 
 				std::unique_lock<std::mutex> lock(write_mtx_);
+				if (outbox_.empty()) {
+					return;
+				}
+
 				::free((char*)outbox_.front().first.data());
 				outbox_.pop_front();