diff --git a/library/src/calculate_price.cpp b/library/src/calculate_price.cpp
index 561acfd..ed5ebc9 100644
--- a/library/src/calculate_price.cpp
+++ b/library/src/calculate_price.cpp
@@ -430,15 +430,16 @@ int CALCULATE_LIBRARY_API compute_next_timestep(parking_tariff_t *tariff, int cu
     qCritical() << "   compute_next_timestep()     currentTimeMinutes: " << currentTimeMinutes;
     qCritical() << "   compute_next_timestep() up/down (1=up, 0=down): " << UpDown;
 
-    std::optional<ATBPaymentOption> paymentOption = tariff->getPaymentOptionForKey(permitType.get());
-    if (!paymentOption.has_value()) {
-        return currentTimeMinutes;
-    }
+    // FIXME
+    //std::optional<ATBPaymentOption> paymentOption = tariff->getPaymentOptionForKey(permitType.get());
+    //if (!paymentOption.has_value()) {
+    //    qCritical() << "   compute_next_timestep() ERROR";
+    //    return currentTimeMinutes;
+    //}
 
     int const paymentOptionIndex = tariff->getPaymentOptionIndex(permitType);
     qCritical() << "   compute_next_timestep()   payment option index: " << paymentOptionIndex;
 
-
     Configuration const *cfg = tariff;
 
     // compute payment method id (e.g. Linear=3, Steps=4)
@@ -510,6 +511,7 @@ int CALCULATE_LIBRARY_API compute_next_timestep(parking_tariff_t *tariff, int cu
                 return  currentTimeMinutes;
             }
             else {
+                qCritical() << "   compute_next_timestep() return next time step:" << stepList[currentStepIndex + 1];
                 return stepList[currentStepIndex + 1];
             }
         }
@@ -519,6 +521,7 @@ int CALCULATE_LIBRARY_API compute_next_timestep(parking_tariff_t *tariff, int cu
                 return  currentTimeMinutes;
             }
             else {
+                qCritical() << "   compute_next_timestep() return next time step:" << stepList[currentStepIndex - 1];
                 return stepList[currentStepIndex - 1];
             }
         }