NullReferenceException with latest version 3.0.67

[odin568]

Describe the bug

Renovate updated the dependency of this library from 2.1.175 -> 3.0.67. Now my builds are failing with:

0>Microsoft.Web.LibraryManager.Build.targets(35,9): Error MSB4018 : The "Microsoft.Web.LibraryManager.Build.RestoreTask" task failed unexpectedly.
System.NullReferenceException: Object reference not set to an instance of an object.
   at Microsoft.Web.LibraryManager.Build.RestoreTask.PopulateFilesWritten(IEnumerable`1 results, IHostInteraction hostInteraction)
   at Microsoft.Web.LibraryManager.Build.RestoreTask.Execute()
   at Microsoft.Build.BackEnd.TaskExecutionHost.Execute()
   at Microsoft.Build.BackEnd.TaskBuilder.ExecuteInstantiatedTask(TaskExecutionHost taskExecutionHost, TaskLoggingContext taskLoggingContext, TaskHost taskHost, ItemBucket bucket, TaskExecutionMode howToExecuteTask)

I don't use any specialties with libman, my libman.json is more or less:

{
  "version": "1.0",
  "libraries": [
    {
      "provider": "jsdelivr",
      "library": "bootstrap@5.3.3",
      "destination": "wwwroot/lib/bootstrap/",
      "files": [
        "**/*",
        "!.md",
        "!package.json"
      ]
    }
...

I am happy to provide more details, but in fact that is all I have configured to use libman with my application (ASP.NET Core 8). Everything runs inside .NET 8 context (latest versions).

To Reproduce

Update from 2.1.175 -> 3.0.67

Expected behavior

Should work as before :)

Screenshots

Additional context

[peterwurzinger]

+1, same behavior but on .NET 9/ASP.NET Core 9. My libman.json looks like that

{
  "defaultProvider": "cdnjs",
  "libraries": [
    {
      "library": "bootstrap@5.3.3",
      "destination": "wwwroot/lib/bootstrap"
    },
    {
      "library": "bootstrap-icons@1.11.3",
      "destination": "wwwroot/lib/bootstrap-icons",
      "files": [
        "font/bootstrap-icons.min.css",
        "font/fonts/bootstrap-icons.woff",
        "font/fonts/bootstrap-icons.woff2"
      ]
    },
    {
      "library": "aspnet-client-validation@0.11.1",
      "destination": "wwwroot/lib/aspnet-client-validation",
      "provider": "jsdelivr",
      "files": [
        "dist/**/*"
      ]
    },
    {
      "library": "sortablejs@1.15.6",
      "destination": "wwwroot/lib/sortable",
      "provider": "jsdelivr",
      "files": [
        "Sortable.js",
        "Sortable.min.js"
      ]
    }
  ],
  "version": "1.0"
}

I integrated Libman via the Build Tools in Microsoft.Web.LibraryManager.Build.
When being used with the Libman CLI by running e.g.

dotnet tool install --global Microsoft.Web.LibraryManager.Cli --version 3.0.67
libman restore

it seems to work though.

[tgritton]

Our builds are also failing with the same error as the original poster:

We are using .net framework 4.8 on an asp web project

lib man json:

libman.json

[oliverw]

Same.

[maggomes]

Same

[bckspc]

Same

[jimmylewis]

fix is out in 3.0.71