diff --git a/yuthon_property/models/yuthon_property.py b/yuthon_property/models/yuthon_property.py
index ab1762419..056e5db48 100644
--- a/yuthon_property/models/yuthon_property.py
+++ b/yuthon_property/models/yuthon_property.py
@@ -113,7 +113,7 @@ class YuthonProperty(models.Model):
             if contract_lines:
                 sorted_lines = sorted(
                     contract_lines,
-                    key=lambda line: line.lease_id.actual_end_time,
+                    key=lambda line: line.lease_id.actual_end_time or date.max,
                     reverse=True
                 )
                 lease_id = sorted_lines[0]