App crashes when attempting to login to market/activate license

When I attempt to login to Samba market or activate my licenses the app crashes and I get an error and the application closes. I was experiencing the same behaviour with 5.2.2 and thought maybe an upgrade would help; I see the same behaviour with 5.2.26.

I tried to login with firewall disabled, proxy disabled, different DNS server with no change.

Removed Samba.Addon.V5PROLicense.dll and reinstalled it. No change.

Invalid JSON primitive

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[General Info]

Application: SambaPOS
Version:     5.2.26
Region:      en
DB:          SQ
Machine:     MOBILE1
User:        wtb
Date:        23/3/2020
Time:        17:18

User Explanation:

wtb said ""
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[Exception Info 1]

Top-level Exception
Type:        System.ArgumentException
Message:     Invalid JSON primitive: .
Source:      System.Web.Extensions
Stack Trace: at System.Web.Script.Serialization.JavaScriptObjectDeserializer.DeserializePrimitiveObject()
   at System.Web.Script.Serialization.JavaScriptObjectDeserializer.DeserializeInternal(Int32 depth)
   at System.Web.Script.Serialization.JavaScriptObjectDeserializer.BasicDeserialize(String input, Int32 depthLimit, JavaScriptSerializer serializer)
   at System.Web.Script.Serialization.JavaScriptSerializer.Deserialize(JavaScriptSerializer serializer, String input, Type type, Int32 depthLimit)
   at Samba.Presentation.ClientLibrary.Modules.MarketModule.WebApiHelpers.Deserialize(String json) in C:\Users\vehbi\Source\Repos\sambapos-v5-pro\Samba.Presentation.ClientLibrary\Modules\MarketModule\WebApiHelpers.cs:line 54
   at Samba.Presentation.ClientLibrary.Modules.MarketModule.WebApiHelpers.GetAuthData(String host, String username, String password, String machineid) in C:\Users\vehbi\Source\Repos\sambapos-v5-pro\Samba.Presentation.ClientLibrary\Modules\MarketModule\WebApiHelpers.cs:line 45
   at Samba.Presentation.ClientLibrary.Modules.MarketModule.MarketModuleViewModel.Authenticate(String host, String userName, String password) in C:\Users\vehbi\Source\Repos\sambapos-v5-pro\Samba.Presentation.ClientLibrary\Modules\MarketModule\MarketModuleViewModel.cs:line 266
   at Samba.Presentation.ClientLibrary.Modules.MarketModule.MarketModuleViewModel.OnUserLogin(String obj) in C:\Users\vehbi\Source\Repos\sambapos-v5-pro\Samba.Presentation.ClientLibrary\Modules\MarketModule\MarketModuleViewModel.cs:line 232
   at Samba.Presentation.ClientLibrary.Modules.MarketModule.MarketModuleViewModel.addonInstallerViewModel_ModuleActivated(Object sender, EventArgs e) in C:\Users\vehbi\Source\Repos\sambapos-v5-pro\Samba.Presentation.ClientLibrary\Modules\MarketModule\MarketModuleViewModel.cs:line 164
   at Samba.Presentation.ClientLibrary.Modules.MarketModule.AddonInstallerViewModel.OnModuleActivated() in C:\Users\vehbi\Source\Repos\sambapos-v5-pro\Samba.Presentation.ClientLibrary\Modules\MarketModule\AddonInstallerViewModel.cs:line 42
   at Samba.Presentation.ClientLibrary.Modules.MarketModule.AddonInstallerViewModel.OnActivateModule(String obj) in C:\Users\vehbi\Source\Repos\sambapos-v5-pro\Samba.Presentation.ClientLibrary\Modules\MarketModule\AddonInstallerViewModel.cs:line 112
   at Microsoft.Practices.Prism.Commands.DelegateCommand`1.<>c__DisplayClass6.<.ctor>b__2(Object o)
   at Microsoft.Practices.Prism.Commands.DelegateCommandBase.Execute(Object parameter)
   at Microsoft.Practices.Prism.Commands.DelegateCommandBase.System.Windows.Input.ICommand.Execute(Object parameter)
   at MS.Internal.Commands.CommandHelpers.CriticalExecuteCommandSource(ICommandSource commandSource, Boolean userInitiated)
   at System.Windows.Controls.Primitives.ButtonBase.OnClick()
   at System.Windows.Controls.Button.OnClick()
   at System.Windows.Controls.Primitives.ButtonBase.OnMouseLeftButtonUp(MouseButtonEventArgs e)
   at System.Windows.UIElement.OnMouseLeftButtonUpThunk(Object sender, MouseButtonEventArgs e)
   at System.Windows.Input.MouseButtonEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)
   at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
   at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
   at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   at System.Windows.UIElement.ReRaiseEventAs(DependencyObject sender, RoutedEventArgs args, RoutedEvent newEvent)
   at System.Windows.UIElement.OnMouseUpThunk(Object sender, MouseButtonEventArgs e)
   at System.Windows.Input.MouseButtonEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)
   at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
   at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
   at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
   at System.Windows.UIElement.RaiseTrustedEvent(RoutedEventArgs args)
   at System.Windows.Input.InputManager.ProcessStagingArea()
   at System.Windows.Input.InputManager.ProcessInput(InputEventArgs input)
   at System.Windows.Input.InputProviderSite.ReportInput(InputReport inputReport)
   at System.Windows.Interop.HwndMouseInputProvider.ReportInput(IntPtr hwnd, InputMode mode, Int32 timestamp, RawMouseActions actions, Int32 x, Int32 y, Int32 wheel)
   at System.Windows.Interop.HwndMouseInputProvider.FilterMessage(IntPtr hwnd, WindowMessage msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at System.Windows.Interop.HwndSource.InputFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)

-----------------------------

[Assembly Info]

mscorlib, Version=4.0.0.0
System, Version=4.0.0.0
Samba.Services, Version=1.0.0.0
Samba.Domain, Version=1.0.0.0
Samba.Infrastructure.Data, Version=1.0.0.0
System.ComponentModel.Composition, Version=4.0.0.0
Samba.Presentation.Services, Version=1.0.0.0
System.Core, Version=4.0.0.0
PresentationCore, Version=4.0.0.0
WindowsBase, Version=4.0.0.0
PresentationFramework, Version=4.0.0.0
DevExpress.Xpf.LayoutControl.v16.2, Version=16.2.13.0
System.Xml, Version=4.0.0.0
DevExpress.Xpf.Grid.v16.2, Version=16.2.13.0
DevExpress.Xpf.Grid.v16.2.Core, Version=16.2.13.0
System.Xaml, Version=4.0.0.0
Samba.Infrastructure, Version=1.0.0.0
Microsoft.Practices.Prism, Version=4.0.0.0
System.Runtime.Serialization, Version=4.0.0.0
Microsoft.Practices.Prism.MefExtensions, Version=4.0.0.0
DevExpress.Xpf.Core.v16.2, Version=16.2.13.0
System.Windows.Forms, Version=4.0.0.0
System.Drawing, Version=4.0.0.0
Samba.Persistance, Version=1.0.0.0
Stateless, Version=1.0.0.0
PropertyTools, Version=2012.4.14.1
Samba.Localization, Version=1.0.0.0
ReachFramework, Version=4.0.0.0
EntityFramework, Version=6.0.0.0
FluentValidation, Version=3.4.0.0
NCalc, Version=1.3.8.0
Microsoft.CSharp, Version=4.0.0.0
Omu.ValueInjecter, Version=2.3.0.0
Microsoft.Practices.ServiceLocation, Version=1.0.0.0
DevExpress.Data.v16.2, Version=16.2.13.0
WindowsInput, Version=1.0.4.0

-----------------------------

[System Info]

Operating System
-Microsoft Windows 7 Professional
--CodeSet = 1252
--CSDVersion = Service Pack 1
--CurrentTimeZone = -360
--FreePhysicalMemory = 13702436
--OSArchitecture = 64-bit
--OSLanguage = 1033
--ServicePackMajorVersion = 1
--ServicePackMinorVersion = 0
--Version = 6.1.7601

Machine
-MOBILE1
--Manufacturer = TOSHIBA
--Model = Satellite C55-A
--TotalPhysicalMemory = 17040654336
--UserName = mobile1\wtb

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Can you send me a PM