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-rw-r--r--src/mongo/client/parallel.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/mongo/client/parallel.cpp b/src/mongo/client/parallel.cpp
index 986d642ecdc..f4a89a9e45b 100644
--- a/src/mongo/client/parallel.cpp
+++ b/src/mongo/client/parallel.cpp
@@ -410,6 +410,7 @@ void ParallelSortClusteredCursor::setupVersionAndHandleSlaveOk(
const DBClientReplicaSet* replConn = dynamic_cast<const DBClientReplicaSet*>(rawConn);
invariant(replConn);
ReplicaSetMonitorPtr rsMonitor = ReplicaSetMonitor::get(replConn->getSetName());
+ uassert(16388, "cannot access unknown replica set:", rsMonitor != nullptr);
if (!rsMonitor->isKnownToHaveGoodPrimary()) {
state->conn->donotCheckVersion();