[VS Plugin] Exception when unloading project

[ssrmm]

Unloading a project in VisualStudio (Solution Explorer -> right-click -> Unload Project) produces

System.InvalidOperationException: Collection was modified; enumeration operation may not execute.

reloading it produces in some cases

System.ArgumentException: An item with the same key has already been added.

Both error messages happen on the server side.

Note that this does not prevent the plugin from working, but it's something that should be fixed nontheless.