diff --git a/library/src/calculator_functions.cpp b/library/src/calculator_functions.cpp
index 9c9bed8..71c4a89 100644
--- a/library/src/calculator_functions.cpp
+++ b/library/src/calculator_functions.cpp
@@ -1833,6 +1833,8 @@ QList<int> Calculator::GetTimeSteps(Configuration *cfg, int paymentOptionIndex)
     if (m_timeSteps.size() > paymentOptionIndex) {
         //qCritical() << __PRETTY_FUNCTION__ << "timeSteps:" << m_timeSteps;
         return m_timeSteps[paymentOptionIndex];
+    } else {
+        m_timeSteps.push_back(QList<int>());
     }
 
     QDateTime start = QDateTime::currentDateTime();