diff --git a/Helpers/Converters.cs b/Helpers/Converters.cs
index ca2ea13..372b431 100644
--- a/Helpers/Converters.cs
+++ b/Helpers/Converters.cs
@@ -102,8 +102,8 @@ public object ConvertBack(object value, Type targetType, object parameter, Cultu
     public class MathMultiplyConverter : IValueConverter
     {
         public object Convert(object value, Type targetType, object parameter, CultureInfo culture) {
-            if (!(value is double)) value = System.Convert.ToDouble(value);
-            if (!(parameter is double)) parameter = System.Convert.ToDouble(parameter);
+            if (!(value is double)) value = System.Convert.ToDouble(value, culture);
+            if (!(parameter is double)) parameter = System.Convert.ToDouble(parameter, culture);
             return (double)value * (double)parameter;
         }
 
@@ -115,7 +115,7 @@ public object ConvertBack(object value, Type targetType, object parameter, Cultu
     public class ThicknessMultiplyConverter : IValueConverter
     {
         public object Convert(object value, Type targetType, object parameter, CultureInfo culture) {
-            var val = System.Convert.ToDouble(value);
+            var val = System.Convert.ToDouble(value, culture);
             var paras = (parameter as string)?.Split(',', ' ');
             if (paras?.Length == 4)
                 return new Thickness(val * double.Parse(paras[0]),
diff --git a/Properties/AssemblyInfo.cs b/Properties/AssemblyInfo.cs
index 6056541..3bbf51a 100644
--- a/Properties/AssemblyInfo.cs
+++ b/Properties/AssemblyInfo.cs
@@ -51,5 +51,5 @@
 // You can specify all the values or you can default the Build and Revision Numbers
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("1.2.8.0")]
-[assembly: AssemblyFileVersion("1.2.8.0")]
+[assembly: AssemblyVersion("1.2.9.0")]
+[assembly: AssemblyFileVersion("1.2.9.0")]