diff --git a/include/customizer/cell_customizer.hpp b/include/customizer/cell_customizer.hpp
index 00d03163a..dfb927cdd 100644
--- a/include/customizer/cell_customizer.hpp
+++ b/include/customizer/cell_customizer.hpp
@@ -116,15 +116,17 @@ class CellCustomizer
                    const std::vector<bool> &allowed_nodes,
                    CellMetric &metric) const
     {
-        Heap heap_exemplar(graph.GetNumberOfNodes());
-        HeapPtr heaps(heap_exemplar);
+        // std::cerr << "Customizing cells\n";
+        // Heap heap_exemplar(graph.GetNumberOfNodes());
+        // HeapPtr heaps(heap_exemplar);
 
         for (std::size_t level = 1; level < partition.GetNumberOfLevels(); ++level)
         {
             tbb::parallel_for(tbb::blocked_range<std::size_t>(0, partition.GetNumberOfCells(level)),
                               [&](const tbb::blocked_range<std::size_t> &range)
                               {
-                                  auto &heap = heaps.local();
+                                Heap heap{graph.GetNumberOfNodes()};
+                                //  auto &heap = heaps.local();
                                   for (auto id = range.begin(), end = range.end(); id != end; ++id)
                                   {
                                       Customize(
diff --git a/include/util/query_heap.hpp b/include/util/query_heap.hpp
index 6f9ef54e1..c79ffc19b 100644
--- a/include/util/query_heap.hpp
+++ b/include/util/query_heap.hpp
@@ -238,6 +238,9 @@ class QueryHeap
         Data data;
     };
 
+    QueryHeap(const QueryHeap& other) = delete;
+    QueryHeap(QueryHeap&& other) = delete;
+
     template <typename... StorageArgs> explicit QueryHeap(StorageArgs... args) : node_index(args...)
     {
         Clear();