diff --git a/src/MahApps.Metro/Controls/TimePicker/DateTimePicker.cs b/src/MahApps.Metro/Controls/TimePicker/DateTimePicker.cs
index a5c4a1fda9..906f22ea49 100644
--- a/src/MahApps.Metro/Controls/TimePicker/DateTimePicker.cs
+++ b/src/MahApps.Metro/Controls/TimePicker/DateTimePicker.cs
@@ -238,7 +238,7 @@ private static void OnSelectedDateChanged(object sender, SelectionChangedEventAr
              */
             dateTimePicker._deactivateWriteValueToTextBox = true;
 
-            var dt = (DateTime?)e.AddedItems[0];
+            var dt =  e.AddedItems.Count > 0 ? (DateTime?)e.AddedItems[0] : default;
             if (dt.HasValue)
             {
                 dateTimePicker.SetCurrentValue(SelectedDateTimeProperty, dt.Value.Date + dateTimePicker.GetSelectedTimeFromGUI());
@@ -279,4 +279,4 @@ private void SetDatePartValues()
             }
         }
     }
-}
\ No newline at end of file
+}