diff --git a/ennstatus/api/model.py b/ennstatus/api/model.py
--- a/ennstatus/api/model.py
+++ b/ennstatus/api/model.py
@@ -255,7 +255,10 @@ class Server:
         except:
             raise NotImplementedError
 
-        self.flags = data.relays[0].flags
+        if data is not None:
+            self.flags = data.relays[0].flags
+        else:
+            raise NotImplementedError
 
     def check_status(self):