diff --git a/src/windows/MainWindow.cpp b/src/windows/MainWindow.cpp
index 3969ba3..3c1f657 100644
--- a/src/windows/MainWindow.cpp
+++ b/src/windows/MainWindow.cpp
@@ -160,8 +160,7 @@ void MainWindow::checkEmptyScanValidity()
      QDate lastScanDate = SQLHelper::queryValue("SELECT ScanDateTime FROM EScan ORDER BY ScanDateTime DESC LIMIT 1").toDate();
      QDate expirationScanDate = lastScanDate.addMonths(1);
      QDate currentDate = QDate::currentDate();
-
-     if(currentDate.daysTo(expirationScanDate) < 0)
+     if(lastScanDate.isNull() || currentDate.daysTo(expirationScanDate) < 0)
      {
          mTabWidget->setTabEnabled(0, false);
          mTabWidget->setTabEnabled(1, false);