From 207a8cc03c5d9c9a9a32d9f49540036d703735ab Mon Sep 17 00:00:00 2001
From: Alexey Milovidov <milovidov@yandex-team.ru>
Date: Fri, 20 Apr 2018 00:36:58 +0300
Subject: [PATCH] Fixed error with Sets, part 2 #2246

---
 dbms/src/DataStreams/CreatingSetsBlockInputStream.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/dbms/src/DataStreams/CreatingSetsBlockInputStream.cpp b/dbms/src/DataStreams/CreatingSetsBlockInputStream.cpp
index d6daab281c9..61a8b0be10a 100644
--- a/dbms/src/DataStreams/CreatingSetsBlockInputStream.cpp
+++ b/dbms/src/DataStreams/CreatingSetsBlockInputStream.cpp
@@ -28,7 +28,9 @@ CreatingSetsBlockInputStream::CreatingSetsBlockInputStream(
         if (elem.second.source)
         {
             children.push_back(elem.second.source);
-            elem.second.set->setHeader(elem.second.source->getHeader());
+
+            if (elem.second.set)
+                elem.second.set->setHeader(elem.second.source->getHeader());
         }
     }