diff --git a/Wox/Converters/StringNullOrEmptyToVisibilityConverter.cs b/Wox/Converters/StringNullOrEmptyToVisibilityConverter.cs
index f536e74735..543fecd322 100644
--- a/Wox/Converters/StringNullOrEmptyToVisibilityConverter.cs
+++ b/Wox/Converters/StringNullOrEmptyToVisibilityConverter.cs
@@ -8,6 +8,8 @@ namespace Wox.Converters
 {
     public class StringNullOrEmptyToVisibilityConverter : ConvertorBase<StringNullOrEmptyToVisibilityConverter>
     {
+        public StringNullOrEmptyToVisibilityConverter() {  }
+
         public override object Convert(object value, Type targetType, object parameter, CultureInfo culture)
         {
             return string.IsNullOrEmpty(value as string) ? Visibility.Collapsed : Visibility.Visible;