diff --git a/src/posit/connect/resources.py b/src/posit/connect/resources.py
index 49e4b657..bfef8365 100644
--- a/src/posit/connect/resources.py
+++ b/src/posit/connect/resources.py
@@ -45,7 +45,7 @@ def __getattr__(self, name):
                 stacklevel=2,
             )
             return self[name]
-        return None
+        raise AttributeError(f"'{self.__class__.__name__}' object has no attribute '{name}'")
 
     def update(self, *args, **kwargs):
         super().update(*args, **kwargs)