diff --git a/pms/models/pms_room_type_availability_plan.py b/pms/models/pms_room_type_availability_plan.py
index bedaf1163..4b2c76794 100644
--- a/pms/models/pms_room_type_availability_plan.py
+++ b/pms/models/pms_room_type_availability_plan.py
@@ -139,7 +139,7 @@ class PmsRoomTypeAvailability(models.Model):
             current_lines = []
         rooms_not_avail = (
             Avail.search(domain)
-            .reservation_line_ids.filtered(lambda l: l.id not in current_lines)
+            .reservation_line_ids.filtered(lambda l: l.id and l.id not in current_lines)
             .room_id.ids
         )
         domain_rooms = []