diff --git a/src/Interpreters/Squashing.cpp b/src/Interpreters/Squashing.cpp
index a15abf968d2..47add495421 100644
--- a/src/Interpreters/Squashing.cpp
+++ b/src/Interpreters/Squashing.cpp
@@ -11,7 +11,7 @@ namespace ErrorCodes
 }
 
 ApplySquashing::ApplySquashing(Block header_)
-    : header(std::move(header_))
+    : header(header_)
 {
 }
 
diff --git a/src/Storages/MergeTree/MutateTask.cpp b/src/Storages/MergeTree/MutateTask.cpp
index c24a643c374..0d1fc46ec76 100644
--- a/src/Storages/MergeTree/MutateTask.cpp
+++ b/src/Storages/MergeTree/MutateTask.cpp
@@ -1286,6 +1286,7 @@ void PartMergerWriter::prepare()
 
     for (size_t i = 0, size = ctx->projections_to_build.size(); i < size; ++i)
     {
+        PlanSquashing plan_squashing(ctx->updated_header, settings.min_insert_block_size_rows, settings.min_insert_block_size_bytes);
         // We split the materialization into multiple stages similar to the process of INSERT SELECT query.
         projection_squash_plannings.emplace_back(ctx->updated_header, settings.min_insert_block_size_rows, settings.min_insert_block_size_bytes);
         projection_squashes.emplace_back(ctx->updated_header);