diff --git a/SubstrateCS/Source/Entity.cs b/SubstrateCS/Source/Entity.cs
index 6dc1702..6be3adf 100644
--- a/SubstrateCS/Source/Entity.cs
+++ b/SubstrateCS/Source/Entity.cs
@@ -112,6 +112,8 @@ namespace Substrate
             _pos = new Vector3();
             _motion = new Vector3();
             _rotation = new Orientation();
+
+            _source = new TagNodeCompound();
         }
 
         /// <summary>
diff --git a/SubstrateCS/Source/Item.cs b/SubstrateCS/Source/Item.cs
index 4c0bff7..28cdd8e 100644
--- a/SubstrateCS/Source/Item.cs
+++ b/SubstrateCS/Source/Item.cs
@@ -37,6 +37,7 @@ namespace Substrate
         public Item ()
         {
             _enchantments = new List<Enchantment>();
+            _source = new TagNodeCompound();
         }
 
         /// <summary>
diff --git a/SubstrateCS/Source/Level.cs b/SubstrateCS/Source/Level.cs
index 03d26c3..bc02f65 100644
--- a/SubstrateCS/Source/Level.cs
+++ b/SubstrateCS/Source/Level.cs
@@ -277,6 +277,8 @@ namespace Substrate
 
             GameType = GameType.SURVIVAL;
             UseMapFeatures = true;
+
+            _source = new TagNodeCompound();
         }
 
         /// <summary>
diff --git a/SubstrateCS/Source/TileEntity.cs b/SubstrateCS/Source/TileEntity.cs
index fe26ab4..616f982 100644
--- a/SubstrateCS/Source/TileEntity.cs
+++ b/SubstrateCS/Source/TileEntity.cs
@@ -75,6 +75,7 @@ namespace Substrate
         /// </summary>
         protected TileEntity ()
         {
+            _source = new TagNodeCompound();
         }
 
         /// <summary>
@@ -84,6 +85,7 @@ namespace Substrate
         public TileEntity (string id)
         {
             _id = id;
+            _source = new TagNodeCompound();
         }
 
         /// <summary>