diff --git a/evennia/contrib/grid/xyzgrid/xyzroom.py b/evennia/contrib/grid/xyzgrid/xyzroom.py
index fd4356ded4..94d890cdc4 100644
--- a/evennia/contrib/grid/xyzgrid/xyzroom.py
+++ b/evennia/contrib/grid/xyzgrid/xyzroom.py
@@ -463,7 +463,10 @@ class XYZRoom(DefaultRoom):
             )
 
             sessions = looker.sessions.get()
-            client_width, _ = sessions[0].get_client_size() if sessions else CLIENT_DEFAULT_WIDTH
+            if sessions:
+                client_width, _ = sessions[0].get_client_size()
+            else:
+                client_width = CLIENT_DEFAULT_WIDTH
 
             map_width = xymap.max_x