diff --git a/library/src/utilities.cpp b/library/src/utilities.cpp
index d3a8b76..9a4f3db 100644
--- a/library/src/utilities.cpp
+++ b/library/src/utilities.cpp
@@ -197,7 +197,8 @@ bool Utilities::IsYearPeriodActive(Configuration* cfg, struct tm* currentDateTim
 }
 
 bool Utilities::IsYearPeriodActive(Configuration const *cfg, QDateTime const &dt) {
-    if (std::none_of(cfg->YearPeriod.cbegin(),
+    if ((cfg->YearPeriod.size() > 0) &&
+        std::none_of(cfg->YearPeriod.cbegin(),
                      cfg->YearPeriod.cend(),
             [&dt](std::pair<int, ATBPeriodYear> const &year) {
                 QDate const d(2004, // 2004 is a leap year