diff --git a/src/Components/Logic/StateMachine.bf b/src/Components/Logic/StateMachine.bf
index 133732c..6ed6e00 100644
--- a/src/Components/Logic/StateMachine.bf
+++ b/src/Components/Logic/StateMachine.bf
@@ -56,6 +56,8 @@ namespace Strawberry
 
 		private Result<bool> Set(TIndex to)
 		{
+			if (!states.ContainsKey(to))
+				Runtime.FatalError("State does not exist in this State Machine. Call Add() first!");
 			if (inStateCall)
 				Runtime.FatalError("Cannot set State directly from inside a State Enter/Exit/Update call. Return the desired State change instead.");