diff --git a/src/alpine_bits_python/alpine_bits_helpers.py b/src/alpine_bits_python/alpine_bits_helpers.py
index 15fe78b..6cd5869 100644
--- a/src/alpine_bits_python/alpine_bits_helpers.py
+++ b/src/alpine_bits_python/alpine_bits_helpers.py
@@ -810,7 +810,7 @@ def _process_single_reservation(reservation: Reservation, customer: Customer, me
     if klick_id is not None and len(klick_id) > 64:
         klick_id = klick_id[:64]
 
-    if klick_id is "":
+    if klick_id == "":
         klick_id = None
 
     hotel_res_id_data = HotelReservationIdData(