diff --git a/CMakeLists.txt b/CMakeLists.txt
index f35ace0..5d8d7ed 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,6 +1,6 @@
 cmake_minimum_required(VERSION 3.20)
 include(cmake/color.cmake)
-set(BLT_VERSION 0.18.28)
+set(BLT_VERSION 0.18.29)
 set(BLT_TEST_VERSION 0.0.1)
 
 set(BLT_TARGET BLT)
diff --git a/include/blt/std/meta.h b/include/blt/std/meta.h
index f6a54b4..d5c4113 100644
--- a/include/blt/std/meta.h
+++ b/include/blt/std/meta.h
@@ -33,6 +33,13 @@ namespace blt::meta
         using Next = arg_helper<IArgs...>;
     };
     
+    template<typename IFirst>
+    struct arg_helper<IFirst>
+    {
+        using First = IFirst;
+        using Next = void;
+    };
+    
     template<>
     struct arg_helper<void>
     {
@@ -97,7 +104,7 @@ namespace blt::meta
     {}; \
     template<typename T> \
     inline constexpr bool has_func_##FUNC##_v = has_func_##FUNC<T>::value; \
-    
+
 }
 
 #endif //BLT_GP_META_H
diff --git a/libraries/parallel-hashmap b/libraries/parallel-hashmap
index 8a889d3..d88c5e1 160000
--- a/libraries/parallel-hashmap
+++ b/libraries/parallel-hashmap
@@ -1 +1 @@
-Subproject commit 8a889d3699b3c09ade435641fb034427f3fd12b6
+Subproject commit d88c5e15079047777b418132ece5879e7c9aaa2b