Cannot search with non-ASCII characters

[tpluscode]

Exception:
Message:Invalid non-ASCII or control character in header: 0x00E9
StackTrace:   at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.FrameHeaders.ThrowInvalidHeaderCharacter(Char ch)
   at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.FrameHeaders.ValidateHeaderCharacters(String headerCharacters)
   at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.FrameHeaders.ValidateHeaderCharacters(StringValues headerValues)
   at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.FrameResponseHeaders.SetValueFast(String key, StringValues value)
   at Nancy.Owin.NancyMiddleware.RequestComplete(NancyContext context, IDictionary`2 environment, Func`2 performPassThrough, Func`2 next)
   at Nancy.Owin.NancyMiddleware.<>c__DisplayClass2_1.<<UseNancy>b__1>d.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at Microsoft.AspNetCore.Owin.WebSocketAcceptAdapter.<>c__DisplayClass6_0.<<AdaptWebSockets>b__0>d.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Hosting.Internal.RequestServicesContainerMiddleware.Invoke(HttpContext httpContext)
   at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.Frame`1.ProcessRequestsAsync()