Stack trace occuring with a crawler or hacker

I am seeing the following stack trace in my log on a site running 3.1.2 - I think because either a crawler or would be hacker is trying to access the site with bad paths rather than any proper use of the site.

Please can it be handled better.

```
2020-03-14 22:20:23.415 +00:00 [ERR] An unhandled exception has occurred while executing the request.
System.InvalidOperationException: The path contains null characters.
at Microsoft.AspNetCore.Internal.UrlDecoder.DecodeCore(Int32& sourceIndex, Int32& destinationIndex, Span`1 buffer, Boolean isFormEncoding)
at Microsoft.AspNetCore.Internal.UrlDecoder.DecodeInPlace(Span`1 buffer, Boolean isFormEncoding)
at Microsoft.AspNetCore.WebUtilities.FormPipeReader.GetDecodedString(ReadOnlySpan`1 readOnlySpan)
at Microsoft.AspNetCore.WebUtilities.FormPipeReader.ParseFormValuesFast(ReadOnlySpan`1 span, KeyValueAccumulator& accumulator, Boolean isFinalBlock, Int32& consumed)
at Microsoft.AspNetCore.WebUtilities.FormPipeReader.ParseFormValues(ReadOnlySequence`1& buffer, KeyValueAccumulator& accumulator, Boolean isFinalBlock)
at Microsoft.AspNetCore.WebUtilities.FormPipeReader.ReadFormAsync(CancellationToken cancellationToken)
at Microsoft.AspNetCore.Http.Features.FormFeature.InnerReadFormAsync(CancellationToken cancellationToken)
at Microsoft.AspNetCore.Antiforgery.DefaultAntiforgeryTokenStore.GetRequestTokensAsync(HttpContext httpContext)
at Microsoft.AspNetCore.Antiforgery.DefaultAntiforgery.ValidateRequestAsync(HttpContext httpContext)
at Microsoft.AspNetCore.Mvc.ViewFeatures.Filters.ValidateAntiforgeryTokenAuthorizationFilter.OnAuthorizationAsync(AuthorizationFilterContext context)
at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.g__Awaited|19_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
at Microsoft.AspNetCore.Routing.EndpointMiddleware.g__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger)
at Joonasw.AspNetCore.SecurityHeaders.Csp.CspMiddleware.Invoke(HttpContext context)
at Microsoft.AspNetCore.Session.SessionMiddleware.Invoke(HttpContext context)
at Microsoft.AspNetCore.Session.SessionMiddleware.Invoke(HttpContext context)
at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)
at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)
at Microsoft.AspNetCore.Diagnostics.ExceptionHandlerMiddleware.g__Awaited|6_0(ExceptionHandlerMiddleware middleware, HttpContext context, Task task)

```