diff --git a/worblehat/cli/main.py b/worblehat/cli/main.py
index 7d107d4..f180351 100644
--- a/worblehat/cli/main.py
+++ b/worblehat/cli/main.py
@@ -1,8 +1,8 @@
 from textwrap import dedent
 
 from sqlalchemy import (
-   event,
-   select,
+    event,
+    select,
 )
 from sqlalchemy.orm import Session
 
@@ -191,10 +191,10 @@ class WorblehatCli(NumberedCmd):
 
     def do_exit(self, _: str):
         if self.sql_session_dirty:
-           if prompt_yes_no('Would you like to save your changes?'):
-               self.sql_session.commit()
-           else:
-               self.sql_session.rollback()
+            if prompt_yes_no('Would you like to save your changes?'):
+                self.sql_session.commit()
+            else:
+                self.sql_session.rollback()
         exit(0)
 
 
diff --git a/worblehat/services/config.py b/worblehat/services/config.py
index 384b472..5b4b199 100644
--- a/worblehat/services/config.py
+++ b/worblehat/services/config.py
@@ -24,6 +24,9 @@ class Config:
     ]
 
     def __class_getitem__(cls, name: str) -> Any:
+        if cls._config is None:
+            raise RuntimeError('Configuration not loaded, call Config.load_configuration() first.')
+
         __config = cls._config
         for attr in name.split('.'):
             __config = __config.get(attr)