diff --git a/src/MeoAssistant/Logger.hpp b/src/MeoAssistant/Logger.hpp
index d46fcd6f13..c9b6502a12 100644
--- a/src/MeoAssistant/Logger.hpp
+++ b/src/MeoAssistant/Logger.hpp
@@ -7,7 +7,6 @@
 #include <thread>
 #include <type_traits>
 #include <utility>
-#include <vector>
 
 #include "AsstRanges.hpp"
 #include "AsstUtils.hpp"
diff --git a/src/MeoAssistant/ResourceLoader.h b/src/MeoAssistant/ResourceLoader.h
index e35f7e0dd9..22de653e07 100644
--- a/src/MeoAssistant/ResourceLoader.h
+++ b/src/MeoAssistant/ResourceLoader.h
@@ -19,7 +19,7 @@ namespace asst
 
     private:
         template <typename T>
-        requires std::is_base_of_v<AbstractResource, T>
+        requires std::is_base_of_v<AbstractResource, T> && Singleton<T>
         bool load_resource(const std::filesystem::path& path)
         {
             if (!std::filesystem::exists(path)) {
@@ -29,7 +29,7 @@ namespace asst
         }
 
         template <typename T>
-        requires std::is_base_of_v<AbstractConfigerWithTempl, T>
+        requires std::is_base_of_v<AbstractConfigerWithTempl, T> && Singleton<T>
         bool load_resource_with_templ(const std::filesystem::path& path, const std::filesystem::path& templ_dir)
         {
             if (!load_resource<T>(path)) {
diff --git a/src/MeoAssistant/SingletonHolder.hpp b/src/MeoAssistant/SingletonHolder.hpp
index 321166fd15..2f95de7c1e 100644
--- a/src/MeoAssistant/SingletonHolder.hpp
+++ b/src/MeoAssistant/SingletonHolder.hpp
@@ -23,4 +23,7 @@ namespace asst
     protected:
         SingletonHolder() = default;
     };
+
+    template <typename T>
+    concept Singleton = std::is_base_of_v<SingletonHolder<T>, T>;
 }