From ab322d38ef3d5c3836df516f2a40c54c5165cafd Mon Sep 17 00:00:00 2001
From: Ian Boros <puppyofkosh@gmail.com>
Date: Wed, 29 May 2019 19:31:05 -0400
Subject: SERVER-41294 shard filtering for $sb

---
 src/mongo/db/pipeline/document_source_cursor.cpp | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'src/mongo/db/pipeline/document_source_cursor.cpp')

diff --git a/src/mongo/db/pipeline/document_source_cursor.cpp b/src/mongo/db/pipeline/document_source_cursor.cpp
index 0015d915acc..1d971d188a8 100644
--- a/src/mongo/db/pipeline/document_source_cursor.cpp
+++ b/src/mongo/db/pipeline/document_source_cursor.cpp
@@ -175,6 +175,10 @@ Pipeline::SourceContainer::iterator DocumentSourceCursor::doOptimizeAt(
     Pipeline::SourceContainer::iterator itr, Pipeline::SourceContainer* container) {
     invariant(*itr == this);
 
+    if (std::next(itr) == container->end()) {
+        return container->end();
+    }
+
     auto nextLimit = dynamic_cast<DocumentSourceLimit*>((*std::next(itr)).get());
 
     if (nextLimit) {
-- 
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