diff --git a/src/gaemstone.ECS/EntityPath.cs b/src/gaemstone.ECS/EntityPath.cs
index 9f68ecb..79b8f4e 100644
--- a/src/gaemstone.ECS/EntityPath.cs
+++ b/src/gaemstone.ECS/EntityPath.cs
@@ -52,6 +52,9 @@ public class EntityPath
 
 	public static unsafe EntityPath From(World world, Entity entity)
 	{
+		if (entity.IsNone) throw new ArgumentException(
+			"entity is Entity.None", nameof(entity));
+
 		var parts = new List<byte[]>(32);
 
 		do {