diff --git a/src/EcsWorld.static.cs b/src/EcsWorld.static.cs
index c87882d..9d3b3f9 100644
--- a/src/EcsWorld.static.cs
+++ b/src/EcsWorld.static.cs
@@ -81,6 +81,7 @@ namespace DCFApixels.DragonECS
 
         public static void ResetStaticState()
         {
+            var nullworld = _worlds[0];
             for (int i = 1; i < _worlds.Length; i++)
             {
                 var world = _worlds[i];
@@ -92,7 +93,8 @@ namespace DCFApixels.DragonECS
                 }
                 world = null;
             }
-            _worlds = Array.Empty<EcsWorld>();
+            _worlds = new EcsWorld[_worldIdDispenser.Capacity];
+            _worlds[0] = nullworld;
             _worldIdDispenser.ReleaseAll();
         }
 
diff --git a/src/Internal/IdDispenser.cs b/src/Internal/IdDispenser.cs
index 1d4aa21..47e993b 100644
--- a/src/Internal/IdDispenser.cs
+++ b/src/Internal/IdDispenser.cs
@@ -35,7 +35,7 @@ namespace DCFApixels.DragonECS.Internal
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
             get { return _usedCount; }
         }
-        public int Size
+        public int Capacity
         {
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
             get { return _size; }
@@ -339,7 +339,7 @@ namespace DCFApixels.DragonECS.Internal
             {
                 get
                 {
-                    Pair[] result = new Pair[_target.Size];
+                    Pair[] result = new Pair[_target.Capacity];
                     for (int i = 0; i < result.Length; i++)
                     {
                         result[i] = new Pair(
@@ -354,7 +354,7 @@ namespace DCFApixels.DragonECS.Internal
             {
                 get
                 {
-                    ID[] result = new ID[_target.Size];
+                    ID[] result = new ID[_target.Capacity];
                     for (int i = 0; i < result.Length; i++)
                     {
                         int id = _target._dense[i];
@@ -365,7 +365,7 @@ namespace DCFApixels.DragonECS.Internal
             }
             public bool IsValid => _target.IsValid();
             public int Count => _target.Count;
-            public int Size => _target.Size;
+            public int Capacity => _target.Capacity;
             public int NullID => _target._nullID;
             internal readonly struct ID
             {