diff --git a/platform_plugin_aspects/signals.py b/platform_plugin_aspects/signals.py
index fc630f8..f03ec07 100644
--- a/platform_plugin_aspects/signals.py
+++ b/platform_plugin_aspects/signals.py
@@ -5,6 +5,7 @@
 from django.db import transaction
 from django.db.models.signals import post_delete, post_save
 from django.dispatch import Signal, receiver
+from opaque_keys import InvalidKeyError
 
 from platform_plugin_aspects.sinks import (
     CourseEnrollmentSink,
@@ -235,7 +236,7 @@ def on_object_tag_deleted(  # pylint: disable=unused-argument  # pragma: no cove
         try:
             CourseOverview.objects.get(id=instance.object_id)
             dump_course_to_clickhouse.delay(instance.object_id)
-        except CourseOverview.DoesNotExist:
+        except (CourseOverview.DoesNotExist, InvalidKeyError):
             pass