Fixed error

27d753ea · Alexey Milovidov · 6f02cd14 · 27d753ea
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dbms/src/Common/RWLock.cpp dbms/src/Common/RWLock.cpp +1 -1

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--- a/dbms/src/Common/RWLock.cpp
+++ b/dbms/src/Common/RWLock.cpp
@@ -153,7 +153,7 @@ RWLockImpl::LockHolder RWLockImpl::getLock(RWLockImpl::Type type, const String &

    if (type == Type::Write || queue.empty() || queue.back().type == Type::Write)
    {
-        if (queue.back().type == Type::Write && query_id != RWLockImpl::NO_QUERY)
+        if (type == Type::Read && !queue.empty() && queue.back().type == Type::Write && query_id != RWLockImpl::NO_QUERY)
            all_read_locks.check(query_id);

        /// Create new group of clients