diff --git a/ydb/core/tx/columnshard/engines/portions/portion_info.h b/ydb/core/tx/columnshard/engines/portions/portion_info.h
index 6fa105745b05..1591765f83e6 100644
--- a/ydb/core/tx/columnshard/engines/portions/portion_info.h
+++ b/ydb/core/tx/columnshard/engines/portions/portion_info.h
@@ -518,6 +518,8 @@ class TPortionInfo {
             if (!columnIdFirst || *columnIdFirst == i.ColumnId) {
                 result += i.GetMeta().GetNumRows();
                 columnIdFirst = i.ColumnId;
+            } else {
+                break;
             }
         }
         return result;