WPF application crash on start up (64 bit)

Hi,

We have a WPF application that crashes on startup for some of our users
trying a sample 'hello world' WPF application also crashes
running 32 WPF bit applications works fine, only 64 bit is crashing.
trying to repair .net framework did not work.
(i can supply dump file if needed)

the exception:

Unhandled exception at 0x00007FFE39857271 (clr.dll) in Overwolf.exe.8160.dmp: 0xC0000005: Access violation reading location 0xFFFFFFFFFFFFFFFF.

the callstack

> > clrjit.dll!00007ffe36709f41() Unknown
clrjit.dll!00007ffe366ebee0() Unknown
clrjit.dll!00007ffe366ed523() Unknown
clrjit.dll!00007ffe366e6c82() Unknown
clrjit.dll!00007ffe366d6098() Unknown
[Managed to Native Transition]
PresentationFramework.dll!System.Windows.Application.Resources.set(System.Windows.ResourceDictionary value) Unknown
System.Xaml.dll!MS.Internal.Xaml.Runtime.ClrObjectRuntime.SetValue(object inst, System.Xaml.XamlMember property, object value) Unknown
System.Xaml.dll!System.Xaml.XamlObjectWriter.Logic_ApplyPropertyValue(MS.Internal.Xaml.Context.ObjectWriterContext ctx, System.Xaml.XamlMember prop, object value, bool onParent) Unknown
System.Xaml.dll!System.Xaml.XamlObjectWriter.Logic_DoAssignmentToParentProperty(MS.Internal.Xaml.Context.ObjectWriterContext ctx) Unknown
System.Xaml.dll!System.Xaml.XamlObjectWriter.Logic_CreateAndAssignToParentStart(MS.Internal.Xaml.Context.ObjectWriterContext ctx) Unknown
System.Xaml.dll!System.Xaml.XamlObjectWriter.WriteStartMember(System.Xaml.XamlMember property) Unknown
PresentationFramework.dll!System.Windows.Markup.WpfXamlLoader.TransformNodes(System.Xaml.XamlReader xamlReader, System.Xaml.XamlObjectWriter xamlWriter, bool onlyLoadOneNode, bool skipJournaledProperties, bool shouldPassLineNumberInfo, System.Xaml.IXamlLineInfo xamlLineInfo, System.Xaml.IXamlLineInfoConsumer xamlLineInfoConsumer, MS.Internal.Xaml.Context.XamlContextStack<System.Windows.Markup.WpfXamlFrame> stack, System.Windows.Markup.IStyleConnector styleConnector) Unknown
PresentationFramework.dll!System.Windows.Markup.WpfXamlLoader.Load(System.Xaml.XamlReader xamlReader, System.Xaml.IXamlObjectWriterFactory writerFactory, bool skipJournaledProperties, object rootObject, System.Xaml.XamlObjectWriterSettings settings, System.Uri baseUri) Unknown
PresentationFramework.dll!System.Windows.Markup.WpfXamlLoader.LoadBaml(System.Xaml.XamlReader xamlReader, bool skipJournaledProperties, object rootObject, System.Xaml.Permissions.XamlAccessLevel accessLevel, System.Uri baseUri) Unknown
PresentationFramework.dll!System.Windows.Markup.XamlReader.LoadBaml(System.IO.Stream stream, System.Windows.Markup.ParserContext parserContext, object parent, bool closeStream) Unknown
Client.Launcher.App.InitializeComponent() Unknown