diff --git a/src/caoscrawler/crawl.py b/src/caoscrawler/crawl.py
index cf171e70341a17cc0536925bac2da1c122f8ab2f..7d321309e26ba05abed551d9de13e8f429e0e12d 100644
--- a/src/caoscrawler/crawl.py
+++ b/src/caoscrawler/crawl.py
@@ -37,6 +37,7 @@ import importlib
 import logging
 import os
 import sys
+from caosdb.exceptions import EmptyUniqueQueryError
 import uuid
 from caosdb.cached import cached_get_entity_by, cache_clear
 import warnings