diff --git a/etl/hubspot/tests/test_abri_flow_triggers.py b/etl/hubspot/tests/test_abri_flow_triggers.py
index 4896da5db..842a4c522 100644
--- a/etl/hubspot/tests/test_abri_flow_triggers.py
+++ b/etl/hubspot/tests/test_abri_flow_triggers.py
@@ -147,6 +147,33 @@ def test_a_changed_surveyor_on_a_booked_deal_builds_an_amend_job_message() -> No
     assert message["third_party_surveyor_identifier"] == "NEWSURVEYOR"
 
 
+def test_a_blank_surveyor_on_a_booked_deal_with_no_stored_surveyor_is_not_a_change() -> None:
+    # Arrange: booking exists; surveyor unset in the DB, blank in HubSpot.
+    old_deal = make_old_deal(
+        project_code=ABRI_PROJECT_CODE,
+        confirmed_survey_date=datetime(2026, 6, 24, tzinfo=timezone.utc),
+        confirmed_survey_time="14:30",
+        third_party_surveyor_identifier=None,
+    )
+    new_deal = make_new_deal(
+        confirmed_survey_date="2026-06-24",
+        confirmed_survey_time="14:30",
+        third_party_surveyor_identifier="",
+    )
+
+    # Act
+    message = HubspotDealDiffer.check_abri_triggers_and_construct_message(
+        hubspot_deal_id=DEAL_ID,
+        new_deal=new_deal,
+        new_project=None,
+        new_listing=LISTING,
+        old_deal=old_deal,
+    )
+
+    # Assert
+    assert message is None
+
+
 def test_a_first_expected_commencement_date_builds_a_tenant_sync_message() -> None:
     # Arrange
     old_deal = make_old_deal(