diff --git a/engine/apps/schedules/ical_utils.py b/engine/apps/schedules/ical_utils.py
index 13d0771b..614d0851 100644
--- a/engine/apps/schedules/ical_utils.py
+++ b/engine/apps/schedules/ical_utils.py
@@ -489,7 +489,10 @@ def get_cached_oncall_users_for_multiple_schedules(schedules: typing.List["OnCal
     # revisit our cached_results and this time populate the results with the actual objects
     for cache_key, oncall_users in cached_results.items():
         schedule_public_primary_key = _get_schedule_public_primary_key_from_schedule_oncall_users_cache_key(cache_key)
-        schedule = schedules[schedule_public_primary_key]
+        schedule = schedules.get(schedule_public_primary_key)
+        if schedule is None:
+            # schedule might have been deleted
+            continue
         oncall_users = [
             users[user_public_primary_key]
             for user_public_primary_key in oncall_users
diff --git a/engine/apps/schedules/tests/test_ical_utils.py b/engine/apps/schedules/tests/test_ical_utils.py
index dd54ec45..ddb97ff3 100644
--- a/engine/apps/schedules/tests/test_ical_utils.py
+++ b/engine/apps/schedules/tests/test_ical_utils.py
@@ -680,3 +680,11 @@ def test_get_cached_oncall_users_for_multiple_schedules(
         schedule2: [users[2], users[3]],
         schedule3: [users[4], users[5]],
     }
+
+    # scenario: schedule is deleted but still in cache
+    schedule1.delete()
+    results = get_cached_oncall_users_for_multiple_schedules(schedules)
+    assert results == {
+        schedule2: [users[2], users[3]],
+        schedule3: [users[4], users[5]],
+    }