diff --git a/lib/service/workers/notification.ex b/lib/service/workers/notification.ex
index f79091041..c76e41550 100644
--- a/lib/service/workers/notification.ex
+++ b/lib/service/workers/notification.ex
@@ -125,6 +125,9 @@ defmodule Mobilizon.Service.Workers.Notification do
 
       :ok
     else
+      {:error, :event_not_found} ->
+        {:cancel, :event_participation_not_found}
+
       err ->
         Logger.debug(inspect(err))
         err