"Uncaught exception in async net callback: Object reference not set to an instance of an object"
failed in attached project (imported from "SteamVR Network Essentials" package form A$) on search from Project.

Uncaught exception in async net callback: Object reference not set to an instance of an object
UnityEditor.AsyncHTTPClient:Done(State, Int32)
at UnityEngine.GUISkin.GetStyle (System.String styleName) [0x00048] in /Users/builduser/buildslave/unity/build/Runtime/IMGUI/Managed/GUISkin.cs:309
at UnityEngine.GUIStyle.op_Implicit (System.String str) [0x0002d] in /Users/builduser/buildslave/unity/build/Runtime/IMGUI/Managed/GUIStyle.cs:515
at UnityEditor.ProjectBrowser.InitSearchMenu () [0x0001e] in /Users/builduser/buildslave/unity/build/Editor/Mono/ProjectBrowser.cs:487
at UnityEditor.ProjectBrowser.AssetStoreSearchEndedCallback () [0x00002] in /Users/builduser/buildslave/unity/build/Editor/Mono/ProjectBrowser.cs:523
at UnityEditor.ObjectListArea+<QueryAssetStore>c__AnonStorey0.<>m__0 (UnityEditor.AssetStoreSearchResults results) [0x00385] in /Users/builduser/buildslave/unity/build/Editor/Mono/ObjectListArea.cs:410
at UnityEditor.AssetStoreResultBase`1[Derived].Parse (UnityEditor.AssetStoreResponse response) [0x00117] in /Users/builduser/buildslave/unity/build/Editor/Mono/AssetStore/AssetStoreClient.cs:89
at UnityEditor.AssetStoreClient+<SearchAssets>c__AnonStorey2.<>m__0 (UnityEditor.AssetStoreResponse ar) [0x00008] in /Users/builduser/buildslave/unity/build/Editor/Mono/AssetStore/AssetStoreClient.cs:751
at UnityEditor.AssetStoreClient+<WrapJsonCallback>c__AnonStorey1.<>m__0 (UnityEditor.AsyncHTTPClient job) [0x0001c] in /Users/builduser/buildslave/unity/build/Editor/Mono/AssetStore/AssetStoreClient.cs:624
UnityEditor.AsyncHTTPClient:Done(State, Int32)

Reproduced in 2017.1.0a1_285a8e3fe401, 5.6.10, 5.5, 5.4....

It reproduces on different versions, so looks like a regression/problems on AssetStore side.