diff --git a/src/Interpreters/Aggregator.cpp b/src/Interpreters/Aggregator.cpp
index bb9e22e5a1b..92aa831f233 100644
--- a/src/Interpreters/Aggregator.cpp
+++ b/src/Interpreters/Aggregator.cpp
@@ -1519,9 +1519,11 @@ void Aggregator::writeToTemporaryFile(AggregatedDataVariants & data_variants, si
     Stopwatch watch;
     size_t rows = data_variants.size();
 
-    std::unique_lock lk(tmp_files_mutex);
-    auto & out_stream = tmp_files.emplace_back(getHeader(false), tmp_data.get(), max_temp_file_size);
-    lk.unlock();
+    auto & out_stream = [this, max_temp_file_size]() -> TemporaryBlockStreamHolder &
+    {
+        std::lock_guard lk(tmp_files_mutex);
+        return tmp_files.emplace_back(getHeader(false), tmp_data.get(), max_temp_file_size);
+    }();
 
     ProfileEvents::increment(ProfileEvents::ExternalAggregationWritePart);
 
@@ -1642,9 +1644,10 @@ Block Aggregator::convertOneBucketToBlock(AggregatedDataVariants & variants, Are
     return block;
 }
 
-std::list<TemporaryBlockStreamHolder> & Aggregator::getTemporaryData()
+std::list<TemporaryBlockStreamHolder> Aggregator::detachTemporaryData()
 {
-    return tmp_files;
+    std::lock_guard lk(tmp_files_mutex);
+    return std::move(tmp_files);
 }
 
 bool Aggregator::hasTemporaryData() const
diff --git a/src/Interpreters/Aggregator.h b/src/Interpreters/Aggregator.h
index 451583946eb..eec64c171a6 100644
--- a/src/Interpreters/Aggregator.h
+++ b/src/Interpreters/Aggregator.h
@@ -311,7 +311,7 @@ public:
 
     bool hasTemporaryData() const;
 
-    std::list<TemporaryBlockStreamHolder> & getTemporaryData();
+    std::list<TemporaryBlockStreamHolder> detachTemporaryData();
 
     /// Get data structure of the result.
     Block getHeader(bool final) const;
@@ -357,7 +357,7 @@ private:
     /// For external aggregation.
     TemporaryDataOnDiskScopePtr tmp_data;
     mutable std::mutex tmp_files_mutex;
-    mutable std::list<TemporaryBlockStreamHolder> tmp_files;
+    mutable std::list<TemporaryBlockStreamHolder> tmp_files TSA_GUARDED_BY(tmp_files_mutex);
 
     size_t min_bytes_for_prefetch = 0;
 
diff --git a/src/Interpreters/tests/gtest_filecache.cpp b/src/Interpreters/tests/gtest_filecache.cpp
index ae45443d4bd..60436604f70 100644
--- a/src/Interpreters/tests/gtest_filecache.cpp
+++ b/src/Interpreters/tests/gtest_filecache.cpp
@@ -988,7 +988,7 @@ try
     {
         TemporaryBlockStreamHolder stream(generateBlock(), tmp_data_scope.get());
         ASSERT_TRUE(stream);
-        /// Do nothitng with stream, just create it and destroy.
+        /// Do nothing with stream, just create it and destroy.
     }
 
     {
diff --git a/src/Processors/Transforms/AggregatingTransform.cpp b/src/Processors/Transforms/AggregatingTransform.cpp
index 2c54788b995..21eec6c305a 100644
--- a/src/Processors/Transforms/AggregatingTransform.cpp
+++ b/src/Processors/Transforms/AggregatingTransform.cpp
@@ -813,10 +813,10 @@ void AggregatingTransform::initGenerate()
         /// Merge external data from all aggregators used in query.
         for (auto & aggregator : *params->aggregator_list_ptr)
         {
-            auto & tmp_data = aggregator.getTemporaryData();
-            num_streams += tmp_data.size();
+            tmp_files = aggregator.detachTemporaryData();
+            num_streams += tmp_files.size();
 
-            for (auto & tmp_stream : tmp_data)
+            for (auto & tmp_stream : tmp_files)
             {
                 auto stat = tmp_stream.finishWriting();
                 compressed_size += stat.compressed_size;
diff --git a/src/Processors/Transforms/AggregatingTransform.h b/src/Processors/Transforms/AggregatingTransform.h
index b9212375c91..a7d18664786 100644
--- a/src/Processors/Transforms/AggregatingTransform.h
+++ b/src/Processors/Transforms/AggregatingTransform.h
@@ -216,6 +216,8 @@ private:
 
     RowsBeforeStepCounterPtr rows_before_aggregation;
 
+    std::list<TemporaryBlockStreamHolder> tmp_files;
+
     void initGenerate();
 };
 
diff --git a/tests/queries/0_stateless/02402_external_disk_mertrics.sql b/tests/queries/0_stateless/02402_external_disk_mertrics.sql
index 7237ea19775..1a3bf9a230a 100644
--- a/tests/queries/0_stateless/02402_external_disk_mertrics.sql
+++ b/tests/queries/0_stateless/02402_external_disk_mertrics.sql
@@ -77,7 +77,8 @@ SELECT
         'ok',
         'fail: ' || toString(count()) || ' ' || toString(any(ProfileEvents))
     )
-    FROM system.query_log WHERE current_database = currentDatabase()
+    FROM system.query_log
+    WHERE current_database = currentDatabase()
         AND log_comment = '02402_external_disk_mertrics/join'
         AND query ILIKE 'SELECT%2097152%' AND type = 'QueryFinish';