diff --git a/ably/realtime/connection.py b/ably/realtime/connection.py
index bd3b21df..a9e24341 100644
--- a/ably/realtime/connection.py
+++ b/ably/realtime/connection.py
@@ -69,7 +69,8 @@ async def ws_read_loop(self):
                 error = msg["error"]
                 if error['nonfatal'] is False:
                     if self.connected_future:
-                        self.connected_future.set_exception(AblyAuthException(error["message"], error["statusCode"], error["code"]))
+                        self.connected_future.set_exception(
+                            AblyAuthException(error["message"], error["statusCode"], error["code"]))
                         self.connected_future = None
 
     @property
diff --git a/ably/realtime/realtime.py b/ably/realtime/realtime.py
index 25f57a2a..36cf1cbe 100644
--- a/ably/realtime/realtime.py
+++ b/ably/realtime/realtime.py
@@ -21,7 +21,7 @@ def __init__(self, key=None, **kwargs):
         if key is not None:
             options = Options(key=key, **kwargs)
         else:
-            options = Options(**kwargs)
+            raise ValueError("Key is missing. Provide an API key")
 
         self.__auth = Auth(self, options)
         self.__options = options
@@ -44,5 +44,5 @@ def options(self):
 
     @property
     def connection(self):
-        """Returns the channels container object"""
+        """Establish realtime connection"""
         return self.__connection