From 215ec2be984ec9baa0eb8516df9b6a486ee9f36c Mon Sep 17 00:00:00 2001
From: Alexey Milovidov <milovidov@yandex-team.ru>
Date: Fri, 13 Jul 2018 20:27:58 +0300
Subject: [PATCH] Tiny improvement [#CLICKHOUSE-3820]

---
 dbms/src/Common/ZooKeeper/ZooKeeperImpl.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/dbms/src/Common/ZooKeeper/ZooKeeperImpl.cpp b/dbms/src/Common/ZooKeeper/ZooKeeperImpl.cpp
index fa39f857a4a..8b80e74c96d 100644
--- a/dbms/src/Common/ZooKeeper/ZooKeeperImpl.cpp
+++ b/dbms/src/Common/ZooKeeper/ZooKeeperImpl.cpp
@@ -1021,6 +1021,10 @@ void ZooKeeper::receiveEvent()
     {
         tryLogCurrentException(__PRETTY_FUNCTION__);
 
+        /// Unrecoverable. Don't leave incorrect state in memory.
+        if (!response)
+            std::terminate();
+
         response->error = ZMARSHALLINGERROR;
         if (request_info.callback)
             request_info.callback(*response);