NullReferenceException: Object reference not set to an instance of an object
UnityEditor.PackageManager.UI.Internal.UpmCache.AddExtraPackageInfo (UnityEditor.PackageManager.PackageInfo packageInfo) (at /Users/hugues.bonin/unity_trunk/Modules/PackageManagerUI/Editor/Services/Upm/UpmCache.cs:135)
UnityEditor.PackageManager.UI.Internal.UpmClient.OnProcessExtraFetchResult (UnityEditor.PackageManager.Requests.SearchRequest request, System.Int64 productId) (at /Users/hugues.bonin/unity_trunk/Modules/PackageManagerUI/Editor/Services/Upm/UpmClient.cs:448)
UnityEditor.PackageManager.UI.Internal.UpmClient+<>c__DisplayClass77_0.<ExtraFetchPackageInfo>b__0 (UnityEditor.PackageManager.Requests.SearchRequest request) (at /Users/hugues.bonin/unity_trunk/Modules/PackageManagerUI/Editor/Services/Upm/UpmClient.cs:411)
UnityEditor.PackageManager.UI.Internal.UpmBaseOperation`1[T].OnSuccess () (at /Users/hugues.bonin/unity_trunk/Modules/PackageManagerUI/Editor/Services/Upm/UpmBaseOperation.cs:183)
UnityEditor.PackageManager.UI.Internal.UpmBaseOperation`1[T].Progress () (at /Users/hugues.bonin/unity_trunk/Modules/PackageManagerUI/Editor/Services/Upm/UpmBaseOperation.cs:145)
UnityEditor.EditorApplication.Internal_CallUpdateFunctions () (at /Users/hugues.bonin/unity_trunk/Editor/Mono/EditorApplication.cs:362)