diff --git a/src/Executors/EcsJoinExecutor.cs b/src/Executors/EcsJoinExecutor.cs
index 424d818..c43a043 100644
--- a/src/Executors/EcsJoinExecutor.cs
+++ b/src/Executors/EcsJoinExecutor.cs
@@ -16,7 +16,11 @@ namespace DCFApixels.DragonECS
         }
         public override bool IsCached
         {
-            get { throw new NotImplementedException(); }
+            get { return false; }
+        }
+        public override int LastCachedCount
+        {
+            get { return 0; }
         }
         #endregion
 
diff --git a/src/Executors/EcsJoinToSubGraphExecutor.cs b/src/Executors/EcsJoinToSubGraphExecutor.cs
index 91d4cdd..9cd7ec6 100644
--- a/src/Executors/EcsJoinToSubGraphExecutor.cs
+++ b/src/Executors/EcsJoinToSubGraphExecutor.cs
@@ -36,7 +36,11 @@ namespace DCFApixels.DragonECS
         }
         public override bool IsCached
         {
-            get { throw new NotImplementedException(); }
+            get { return false; }
+        }
+        public override int LastCachedCount
+        {
+            get { return 0; }
         }
         #endregion