diff --git a/unittests/test_crawler.py b/unittests/test_crawler.py
index 88dc32c3e488a15f313ce9a787e928249b3b8f7a..a48b5e16ad1a71beeb4a5bf1c2ac52f67bbd7afe 100644
--- a/unittests/test_crawler.py
+++ b/unittests/test_crawler.py
@@ -783,8 +783,8 @@ def test_split_into_inserts_and_updates_backref(crawler_mocked_for_backref_test)
     entlist = [referenced, db.Record(name="A").add_parent("BR").add_property("ref", referenced), ]
 
     # Test without referencing object
-    # currently a NotImplementedError is raised if necessary properties are missing.
-    with raises(NotImplementedError):
+    # currently a RuntimeError is raised if necessary properties are missing.
+    with raises(RuntimeError):
         crawler.split_into_inserts_and_updates([db.Record(name="B").add_parent("C")])
 
     # identifiables were not yet checked