diff --git a/library/src/calculate_price.cpp b/library/src/calculate_price.cpp
index 157bcd8..2d34c7b 100644
--- a/library/src/calculate_price.cpp
+++ b/library/src/calculate_price.cpp
@@ -1135,6 +1135,10 @@ CalcState CALCULATE_LIBRARY_API compute_duration_for_parking_ticket(
         QDateTime &ticketEndTime,
         PermitType permitType)
 {
+    if (tariffs.count(permitType) > 0) {
+        tariff = tariffs[permitType].get();
+    }
+
     tariff->getPaymentOptions(0).pop_max_price
         = tariff->getPaymentOptions(0).pop_max_price_save;
 
@@ -1142,8 +1146,15 @@ CalcState CALCULATE_LIBRARY_API compute_duration_for_parking_ticket(
 
     bool prepaid = true;
 
+    qCritical() << __func__ << ":" << __LINE__ << "   permit type (int): " << static_cast<int>(permitType);
+    qCritical() << __func__ << ":" << __LINE__ << "permit type (string): " << permitType.toString();
+    qCritical() << __func__ << ":" << __LINE__ << "     tariff-includes: " << tariff->getTariffIncludes();
+
     int paymentOptionIndex = getPaymentOptionIndex(*tariff, start_parking_time);
+
     qCritical() << __func__ << ":" << __LINE__ << "payment option index: " << paymentOptionIndex;
+
+
     if (paymentOptionIndex == -1) {
         paymentOptionIndex = tariff->getPaymentOptionIndex(permitType);
     }