diff --git a/medcat/config.py b/medcat/config.py
index 07cf6f7f1..b2e324deb 100644
--- a/medcat/config.py
+++ b/medcat/config.py
@@ -28,7 +28,11 @@ class FakeDict:
     """FakeDict that allows the use of the __getitem__ and __setitem__ method for legacy access."""
 
     def __getitem__(self, arg: str) -> Any:
-        return getattr(self, arg)
+        try:
+            return getattr(self, arg)
+        except AttributeError as e:
+            raise KeyError from e
+
 
     def __setitem__(self, arg: str, val) -> None:
         setattr(self, arg, val)