"Call to Node module failed with error: TypeError: Cannot read property 'substring' of undefined" after upgrading to aspnet-webpack 1.0.20 npm packge. #376

Unhandled Exception: System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.AggregateException: One or more errors occurred. (Call to Node module failed with error: TypeError: Cannot read property 'substring' of undefined
    at firstIndexOfStringStartingWith (E:\P\Fantasy\src\Fantasy\node_modules\aspnet-webpack\WebpackDevMiddleware.js:192:22)
    at E:\P\Fantasy\src\Fantasy\node_modules\aspnet-webpack\WebpackDevMiddleware.js:26:22
    at Array.forEach (native)
    at attachWebpackDevMiddleware (E:\P\Fantasy\src\Fantasy\node_modules\aspnet-webpack\WebpackDevMiddleware.js:20:51)
    at E:\P\Fantasy\src\Fantasy\node_modules\aspnet-webpack\WebpackDevMiddleware.js:162:21
    at Array.forEach (native)
    at Server.<anonymous> (E:\P\Fantasy\src\Fantasy\node_modules\aspnet-webpack\WebpackDevMiddleware.js:145:32)
    at Server.g (events.js:291:16)
    at emitNone (events.js:86:13)
    at Server.emit (events.js:185:7)) ---> System.Exception: Call to Node module failed with error: TypeError: Cannot read property 'substring' of undefined
    at firstIndexOfStringStartingWith (E:\P\Fantasy\src\Fantasy\node_modules\aspnet-webpack\WebpackDevMiddleware.js:192:22)
    at E:\P\Fantasy\src\Fantasy\node_modules\aspnet-webpack\WebpackDevMiddleware.js:26:22
    at Array.forEach (native)
    at attachWebpackDevMiddleware (E:\P\Fantasy\src\Fantasy\node_modules\aspnet-webpack\WebpackDevMiddleware.js:20:51)
    at E:\P\Fantasy\src\Fantasy\node_modules\aspnet-webpack\WebpackDevMiddleware.js:162:21
    at Array.forEach (native)
    at Server.<anonymous> (E:\P\Fantasy\src\Fantasy\node_modules\aspnet-webpack\WebpackDevMiddleware.js:145:32)
    at Server.g (events.js:291:16)
    at emitNone (events.js:86:13)
    at Server.emit (events.js:185:7)
   at Microsoft.AspNetCore.NodeServices.HostingModels.HttpNodeInstance.<InvokeExportAsync>d__7`1.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
   at Microsoft.AspNetCore.NodeServices.HostingModels.OutOfProcessNodeInstance.<InvokeExportAsync>d__13`1.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
   at Microsoft.AspNetCore.NodeServices.NodeServicesImpl.<InvokeExportWithPossibleRetryAsync>d__10`1.MoveNext()
   --- End of inner exception stack trace ---
   at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
   at System.Threading.Tasks.Task`1.GetResultCore(Boolean waitCompletionNotification)
   at Microsoft.AspNetCore.Builder.WebpackDevMiddleware.UseWebpackDevMiddleware(IApplicationBuilder appBuilder, WebpackDevMiddlewareOptions options)
   at Fantasy.Startup.Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
   --- End of inner exception stack trace ---
   at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor)
   at System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments)
   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
   at Microsoft.AspNetCore.Hosting.Internal.ConfigureBuilder.Invoke(Object instance, IApplicationBuilder builder)
   at Microsoft.AspNetCore.Hosting.Internal.WebHost.BuildApplication()
   at Microsoft.AspNetCore.Hosting.WebHostBuilder.Build()
   at Fantasy.Program.Initialize(String[] args)
   at Fantasy.Program.Main(String[] args)

(...)
  "devDependencies": {
    "aspnet-webpack": "^1.0.16",    --> auto upgrade minor
    "babel-core": "^6.5.2",
    "babel-loader": "^6.2.3",
    "babel-preset-es2015": "^6.5.0",
    "css-loader": "^0.23.1",
    "extendify": "^1.0.0",
    "extract-text-webpack-plugin": "^1.0.1",
    "file-loader": "^0.9.0",
    "style-loader": "^0.13.1",
    "url-loader": "^0.5.7",
    "webpack": "1.13.2",
    "webpack-hot-middleware": "2.13.0"
  }

{
    "dependencies": {
    "Microsoft.AspNetCore.Authentication.Cookies": "1.0.0",
    "Microsoft.AspNetCore.Authentication.Facebook": "1.0.0",
    "Microsoft.AspNetCore.Diagnostics": "1.0.0",
    "Microsoft.AspNetCore.Identity": "1.0.0",
    "Microsoft.AspNetCore.Identity.EntityFrameworkCore": "1.0.0",
    "Microsoft.AspNetCore.Mvc": "1.0.1",
    "Microsoft.AspNetCore.Razor.Tools": {
      "version": "1.0.0-preview2-final",
      "type": "build"
    },
        "Microsoft.AspNetCore.Server.IISIntegration": "1.0.0",
        "Microsoft.AspNetCore.Server.Kestrel": "1.0.1",
        "Microsoft.AspNetCore.Server.Kestrel.Https": "1.0.1",
    "Microsoft.AspNetCore.SpaServices": "1.0.0-*",  --> The latest I see in intelisense is "1.0.0-beta-000019"
        "Microsoft.AspNetCore.StaticFiles": "1.0.0",
        "Microsoft.EntityFrameworkCore.InMemory": "1.0.1",
        "Microsoft.EntityFrameworkCore.SqlServer": "1.0.0",
        "Microsoft.EntityFrameworkCore.SqlServer.Design": {
            "version": "1.0.0",
            "type": "build"
        },
        "Microsoft.EntityFrameworkCore.Tools": {
            "version": "1.0.0-preview2-final",
            "type": "build"
        },
        "Microsoft.Extensions.Configuration.CommandLine": "1.0.0",
        "Microsoft.Extensions.Configuration.EnvironmentVariables": "1.0.0",
        "Microsoft.Extensions.Configuration.Json": "1.0.0",
        "Microsoft.Extensions.Configuration.UserSecrets": "1.0.0",
        "Microsoft.Extensions.Logging": "1.0.0",
        "Microsoft.Extensions.Logging.Console": "1.0.0",
        "Microsoft.Extensions.Logging.Debug": "1.0.0",
        "Microsoft.Extensions.Options.ConfigurationExtensions": "1.0.0",
        "Microsoft.NETCore.App": {
            "version": "1.0.1",
            "type": "platform"
        },
        "System.Security.Cryptography.X509Certificates": "4.1.0",
        "System.Xml.XmlSerializer": "4.0.11"
    },

    "tools": {
        "Microsoft.AspNetCore.Razor.Tools": "1.0.0-preview2-final",
        "Microsoft.AspNetCore.Server.IISIntegration.Tools": "1.0.0-preview2-final",
        "Microsoft.DotNet.Watcher.Tools": "1.0.0-preview2-final",
        "Microsoft.EntityFrameworkCore.Tools": "1.0.0-preview2-final",
        "Microsoft.Extensions.SecretManager.Tools": "1.0.0-preview2-final",
        "Microsoft.VisualStudio.Web.CodeGeneration.Tools": {
            "version": "1.0.0-preview2-final",
            "imports": [
                "portable-net45+win8"
            ]
        }
    },

    "frameworks": {
        "netcoreapp1.0": {
            "imports": [
                "dotnet5.6",
                "portable-net45+win8"
            ]
        }
    },

    "buildOptions": {
        "emitEntryPoint": true,
        "preserveCompilationContext": true
    },

    "runtimeOptions": {
        "configProperties": {
            "System.GC.Server": true
        }
    }
}

        public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
        {
(...)
                app.UseWebpackDevMiddleware(new WebpackDevMiddlewareOptions
                {
                    HotModuleReplacement = true,
                });