diff --git a/ydb/library/yql/providers/yt/provider/yql_yt_helpers.cpp b/ydb/library/yql/providers/yt/provider/yql_yt_helpers.cpp
index abb77fa1f017..1238e33203e8 100644
--- a/ydb/library/yql/providers/yt/provider/yql_yt_helpers.cpp
+++ b/ydb/library/yql/providers/yt/provider/yql_yt_helpers.cpp
@@ -121,7 +121,7 @@ bool IsYtIsolatedLambdaImpl(const TExprNode& lambdaBody, TSyncMap& syncList, TSt
             if (usedCluster && !UpdateUsedCluster(*usedCluster, TString{op.DataSink().Cluster().Value()})) {
                 return false;
             }
-            syncList.emplace(op.Ptr(), syncList.size());
+            syncList.emplace(out.Cast().Operation().Ptr(), syncList.size());
             return true;
         }
     }