diff --git a/utils/businesslogic.py b/utils/businesslogic.py
index bf6827a4..032f13f8 100644
--- a/utils/businesslogic.py
+++ b/utils/businesslogic.py
@@ -394,7 +394,7 @@ def _service_paid_by_transaction(servicesubscription, transaction, add_days):
             logger.debug(
                 f"{servicesubscription} paid for first time, adding bonus of {bonus_days}"
             )
-            if transaction.comment != "":
+            if transaction.comment:
                 transaction.comment = transaction.comment + f"\r\nFirst payment of {servicesubscription} - added {bonus_days.days} bonus days."
             else:
                 transaction.comment = f"First payment of {servicesubscription} - added {bonus_days.days} bonus days."