diff --git a/dbms/src/Storages/MergeTree/MergeTreeData.cpp b/dbms/src/Storages/MergeTree/MergeTreeData.cpp
index 04d95dd151a..50afbecc5d1 100644
--- a/dbms/src/Storages/MergeTree/MergeTreeData.cpp
+++ b/dbms/src/Storages/MergeTree/MergeTreeData.cpp
@@ -633,8 +633,10 @@ void MergeTreeData::setTTLExpressions(const ColumnsDescription::ColumnTTLs & new
 
     if (new_ttl_table_ast)
     {
+        std::unique_lock<std::mutex> move_ttl_entries_lock;
         if (!only_check)
         {
+            move_ttl_entries_lock = std::unique_lock<std::mutex>(move_ttl_entries_mutex);
             move_ttl_entries.clear();
             ttl_table_ast = nullptr;
         }
@@ -677,9 +679,7 @@ void MergeTreeData::setTTLExpressions(const ColumnsDescription::ColumnTTLs & new
                 }
 
                 if (!only_check)
-                {
                     move_ttl_entries.emplace_back(std::move(new_ttl_entry));
-                }
             }
         }
     }
@@ -3299,7 +3299,7 @@ ReservationPtr MergeTreeData::tryReserveSpacePreferringTTLRules(UInt64 expected_
     ReservationPtr reservation;
 
     auto ttl_entry = selectTTLEntryForTTLInfos(ttl_infos, time_of_move);
-    if (ttl_entry != nullptr)
+    if (ttl_entry)
     {
         SpacePtr destination_ptr = ttl_entry->getDestination(storage_policy);
         if (!destination_ptr)
@@ -3358,27 +3358,28 @@ bool MergeTreeData::TTLEntry::isPartInDestination(const StoragePolicyPtr & polic
     return false;
 }
 
-const MergeTreeData::TTLEntry * MergeTreeData::selectTTLEntryForTTLInfos(
+std::optional<MergeTreeData::TTLEntry> MergeTreeData::selectTTLEntryForTTLInfos(
         const MergeTreeDataPart::TTLInfos & ttl_infos,
         time_t time_of_move) const
 {
-    const MergeTreeData::TTLEntry * result = nullptr;
-    /// Prefer TTL rule which went into action last.
     time_t max_max_ttl = 0;
+    std::vector<DB::MergeTreeData::TTLEntry>::const_iterator best_entry_it;
 
-    for (const auto & ttl_entry : move_ttl_entries)
+    auto lock = std::lock_guard(move_ttl_entries_mutex);
+    for (auto ttl_entry_it = move_ttl_entries.begin(); ttl_entry_it != move_ttl_entries.end(); ++ttl_entry_it)
     {
-        auto ttl_info_it = ttl_infos.moves_ttl.find(ttl_entry.result_column);
+        auto ttl_info_it = ttl_infos.moves_ttl.find(ttl_entry_it->result_column);
+        /// Prefer TTL rule which went into action last.
         if (ttl_info_it != ttl_infos.moves_ttl.end()
                 && ttl_info_it->second.max <= time_of_move
                 && max_max_ttl <= ttl_info_it->second.max)
         {
-            result = &ttl_entry;
+            best_entry_it = ttl_entry_it;
             max_max_ttl = ttl_info_it->second.max;
         }
     }
 
-    return result;
+    return max_max_ttl ? *best_entry_it : std::optional<MergeTreeData::TTLEntry>();
 }
 
 MergeTreeData::DataParts MergeTreeData::getDataParts(const DataPartStates & affordable_states) const
diff --git a/dbms/src/Storages/MergeTree/MergeTreeData.h b/dbms/src/Storages/MergeTree/MergeTreeData.h
index ca2730a8aef..628420cf692 100644
--- a/dbms/src/Storages/MergeTree/MergeTreeData.h
+++ b/dbms/src/Storages/MergeTree/MergeTreeData.h
@@ -737,12 +737,16 @@ public:
         bool isPartInDestination(const StoragePolicyPtr & policy, const MergeTreeDataPart & part) const;
     };
 
-    const TTLEntry * selectTTLEntryForTTLInfos(const MergeTreeDataPart::TTLInfos & ttl_infos, time_t time_of_move) const;
+    std::optional<TTLEntry> selectTTLEntryForTTLInfos(const MergeTreeDataPart::TTLInfos & ttl_infos, time_t time_of_move) const;
 
     using TTLEntriesByName = std::unordered_map<String, TTLEntry>;
     TTLEntriesByName column_ttl_entries_by_name;
 
     TTLEntry ttl_table_entry;
+
+    /// This mutex is required for background move operations which do not obtain global locks.
+    mutable std::mutex move_ttl_entries_mutex;
+
     std::vector<TTLEntry> move_ttl_entries;
 
     String sampling_expr_column_name;
diff --git a/dbms/src/Storages/MergeTree/MergeTreePartsMover.cpp b/dbms/src/Storages/MergeTree/MergeTreePartsMover.cpp
index 551a0de1338..0e3538409e9 100644
--- a/dbms/src/Storages/MergeTree/MergeTreePartsMover.cpp
+++ b/dbms/src/Storages/MergeTree/MergeTreePartsMover.cpp
@@ -127,14 +127,14 @@ bool MergeTreePartsMover::selectPartsForMove(
         if (!can_move(part, &reason))
             continue;
 
-        const MergeTreeData::TTLEntry * ttl_entry_ptr = part->storage.selectTTLEntryForTTLInfos(part->ttl_infos, time_of_move);
+        auto ttl_entry = part->storage.selectTTLEntryForTTLInfos(part->ttl_infos, time_of_move);
         auto to_insert = need_to_move.find(part->disk);
         ReservationPtr reservation;
-        if (ttl_entry_ptr)
+        if (ttl_entry)
         {
-            auto destination = ttl_entry_ptr->getDestination(policy);
-            if (destination && !ttl_entry_ptr->isPartInDestination(policy, *part))
-                reservation = part->storage.tryReserveSpace(part->bytes_on_disk, ttl_entry_ptr->getDestination(policy));
+            auto destination = ttl_entry->getDestination(policy);
+            if (destination && !ttl_entry->isPartInDestination(policy, *part))
+                reservation = part->storage.tryReserveSpace(part->bytes_on_disk, ttl_entry->getDestination(policy));
         }
 
         if (reservation) /// Found reservation by TTL rule.