diff --git a/hyrex/dispatcher/sqlc/set_orphaned_task_execution_to_lost_and_retry.py b/hyrex/dispatcher/sqlc/set_orphaned_task_execution_to_lost_and_retry.py
index 6c05533..c51af0b 100644
--- a/hyrex/dispatcher/sqlc/set_orphaned_task_execution_to_lost_and_retry.py
+++ b/hyrex/dispatcher/sqlc/set_orphaned_task_execution_to_lost_and_retry.py
@@ -64,6 +64,7 @@
     NOW()
 FROM lost_tasks
 WHERE attempt_number < max_retries
+ON CONFLICT (task_name, idempotency_key) WHERE idempotency_key IS NOT NULL DO NOTHING
 """