diff --git a/VContainer/Assets/VContainer/Runtime/Registry.cs b/VContainer/Assets/VContainer/Runtime/Registry.cs
index 7117a6a6..f348ff8f 100644
--- a/VContainer/Assets/VContainer/Runtime/Registry.cs
+++ b/VContainer/Assets/VContainer/Runtime/Registry.cs
@@ -46,7 +46,7 @@ public static Registry Build(Registration[] registrations)
 
         static void AddToBuildBuffer(IDictionary<Type, Registration> buf, Type service, Registration registration)
         {
-            if (buf.TryGetValue(service, out var exists))
+            if (buf.TryGetValue(service, out var exists) && exists != null)
             {
                 CollectionInstanceProvider collection;
                 if (buf.TryGetValue(RuntimeTypeCache.EnumerableTypeOf(service), out var found) &&