From dadbe338297d6f51eb6d4fe58a90d3d4a565dd31 Mon Sep 17 00:00:00 2001
From: sebas77 <ssense@tiscali.it>
Date: Tue, 31 Oct 2017 12:12:18 +0000
Subject: [PATCH] - found the time to fix properly a bug previously fixed.

---
 ECS/EnginesRoot.cs | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/ECS/EnginesRoot.cs b/ECS/EnginesRoot.cs
index 22dd0f7..6ff095b 100644
--- a/ECS/EnginesRoot.cs
+++ b/ECS/EnginesRoot.cs
@@ -159,9 +159,14 @@ namespace Svelto.ECS
         {
             _implementedInterfaceTypes.Clear();
 
+            var type = typeof(IEngine);
+
             for (int index = 0; index < implementedInterfaces.Length; index++)
             {
                 var interfaceType = implementedInterfaces[index];
+
+                if (interfaceType.IsAssignableFrom(type) == false)
+                    continue;
 #if !NETFX_CORE
 
                 if (false == interfaceType.IsGenericType)
@@ -174,7 +179,7 @@ namespace Svelto.ECS
 
                 var genericTypeDefinition = interfaceType.GetGenericTypeDefinition();
 
-                _implementedInterfaceTypes[genericTypeDefinition] = interfaceType.GetGenericArguments();
+                _implementedInterfaceTypes.Add(genericTypeDefinition, interfaceType.GetGenericArguments());
             }
         }