diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0ea7bf4..93a7578 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 3.25)
-project(blt-gp VERSION 0.0.84)
+project(blt-gp VERSION 0.0.85)
 
 include(CTest)
 
diff --git a/include/blt/gp/program.h b/include/blt/gp/program.h
index 6362f20..f6bdb7e 100644
--- a/include/blt/gp/program.h
+++ b/include/blt/gp/program.h
@@ -506,7 +506,7 @@ namespace blt::gp
             
             operator_storage storage;
             population_t current_pop;
-            population_stats current_stats;
+            population_stats current_stats {};
             population_t next_pop;
             std::atomic_uint64_t current_generation = 0;
             
diff --git a/include/blt/gp/stack.h b/include/blt/gp/stack.h
index 90777fb..6d8225d 100644
--- a/include/blt/gp/stack.h
+++ b/include/blt/gp/stack.h
@@ -164,6 +164,7 @@ namespace blt::gp
             {
                 using NO_REF_T = std::remove_cv_t<std::remove_reference_t<T>>;
                 static_assert(std::is_trivially_copyable_v<NO_REF_T> && "Type must be bitwise copyable!");
+                static_assert(alignof(NO_REF_T) <= MAX_ALIGNMENT && "Type must not be greater than the max alignment!");
                 auto ptr = allocate_bytes<NO_REF_T>();
                 head->metadata.offset = static_cast<blt::u8*>(ptr) + aligned_size<NO_REF_T>();
                 new(ptr) NO_REF_T(std::forward<T>(value));
@@ -487,7 +488,7 @@ namespace blt::gp
             
             static block* allocate_block(blt::size_t bytes)
             {
-                auto size = to_nearest_page_size(bytes);
+                auto size = to_nearest_page_size(bytes + sizeof(typename block::block_metadata_t));
                 auto* data = std::aligned_alloc(PAGE_SIZE, size);
                 //auto* data = get_allocator().allocate(size);
                 new(data) block{size};
diff --git a/include/blt/gp/tree.h b/include/blt/gp/tree.h
index 6fedd9f..72df3a6 100644
--- a/include/blt/gp/tree.h
+++ b/include/blt/gp/tree.h
@@ -152,7 +152,7 @@ namespace blt::gp
         std::atomic<double> average_fitness = 0;
         std::atomic<double> best_fitness = 0;
         std::atomic<double> worst_fitness = 1;
-        std::vector<double> normalized_fitness;
+        std::vector<double> normalized_fitness{};
         
         void clear()
         {