diff --git a/divent/bot.py b/divent/bot.py
index 834e6ac..00e018f 100644
--- a/divent/bot.py
+++ b/divent/bot.py
@@ -332,7 +332,10 @@ async def ical(entity_id: str):
 
         for guild in client.guilds:
             for scheduled_event in guild.scheduled_events:
-                if user.id in EVENTS_CACHE[scheduled_event.id]:
+                if (
+                    scheduled_event.id in EVENTS_CACHE
+                    and user.id in EVENTS_CACHE[scheduled_event.id]
+                ):
                     event = make_event(scheduled_event)
                     calendar.events.append(event)