diff --git a/goocalendar/_calendar.py b/goocalendar/_calendar.py
index 1144bc25103e3a678b68bd0a47a9d0a8d6716eaa_Z29vY2FsZW5kYXIvX2NhbGVuZGFyLnB5..1ca78ffe6068845bb629173e00073efbc23fbf45_Z29vY2FsZW5kYXIvX2NhbGVuZGFyLnB5 100644
--- a/goocalendar/_calendar.py
+++ b/goocalendar/_calendar.py
@@ -606,7 +606,8 @@
                     event_item.type = 'leftright'
                 event_item.update()
         # Add the day title
-        max_y += self._selected_day.line_height
+        if self._selected_day:
+            max_y += self._selected_day.line_height
 
         if self.view == "month":
             return