Upgrade Packages per-Specific Feed can throw NullReferenceException with useless log message

[jzabroski]

NuGet Product Used

Visual Studio Package Management UI

Product Version

Nuget Package Manager 6.13.2 (Visual Studio 17.13.2)

Worked before?

Never seen this error before. Previously was on VS 17.12.5 (Feb 11, 2025 release)

Impact

It bothers me. A fix would be nice

Repro Steps & Context

This happens in-between uninstall/install and restore steps.

Verbose Logs

Successfully uninstalled 'TestingHelpers 1.5.23' from CMG.Tests
Successfully installed 'TestingHelpers 1.5.26' to CMG.Tests
Executing nuget actions took 151 ms
Time Elapsed: 00:00:08.3943593
========== Finished ==========

Object reference not set to an instance of an object.
Restored D:\Source\Common.Tests\Common.Tests.csproj (in 870 ms).

[Nigusu-Allehu]

Thanks for the report! I tried to reproduce this issue by installing and uninstalling a package (e.g., Newtonsoft.Json) using the PMUI with a specific feed selected, but I wasn’t able to hit the same error.

Could you clarify:

• Does this only happen with a specific package?
• Is there a particular project type or setup involved?
• Does it consistently repro in your environment?

Any additional details would help us narrow it down.

[jzabroski]

it doesn't consist repeat but initial thought was c# control flow analysis should catch potential NREs in the code