diff --git a/ydb/library/yql/core/yql_execution.h b/ydb/library/yql/core/yql_execution.h
index 7a359ff0ec9c..621bbe1934ba 100644
--- a/ydb/library/yql/core/yql_execution.h
+++ b/ydb/library/yql/core/yql_execution.h
@@ -49,7 +49,7 @@ namespace NYql {
             ui64 Failed = 0ULL;
             ui64 Lost = 0ULL;
             ui64 Pending = 0ULL;
-            THashMap<TString, i64> Custom;
+            THashMap<TString, i64> Custom = {};
             bool operator==(const TCounters& rhs) const noexcept {
                 return Completed == rhs.Completed &&
                        Running == rhs.Running &&