macOS client crashes when opening workbook from recent files menu

[abock]

1.4.0-beta1 and 1.4.0-rc1 crashing when going to Xamarin Workbooks → File → Open Recent or via the dock menu.

Xamarin Workbooks
Copyright 2016-2017 Microsoft. All rights reserved.
Copyright 2014-2016 Xamarin Inc. All rights reserved.
├─ Version: 1.4.0-beta1+109
├─ Date: 12/22/2017 3:36:18 PM
├─ Hash: 3b0fb936be9e00f2da40fc9da5309c482dfce048
├─ Branch: master
└─ Lane: Workbooks & Inspector (Mac)

[Info][00:00:00.1226140] Telemetry (.ctor): Telemetry Session ID: dc4b9f6d-95e6-436d-a03a-b754be16a5e6 @ /Users/builder/vsts/_work/11/s/Clients/Xamarin.Interactive.Client/Telemetry/Client.cs:59
[Info][00:00:00.3682170] UpdaterService (CheckForUpdatesInBackground): checking for updates @ /Users/builder/vsts/_work/11/s/Clients/Xamarin.Interactive.Client/Client/Updater/UpdaterService.cs:257
[Info][00:00:00.8376900] UpdaterService (CheckForUpdatesInBackground): update available: https://dl.xamarin.com/interactive/XamarinInteractive-1.4.0-beta1.pkg @ /Users/builder/vsts/_work/11/s/Clients/Xamarin.Interactive.Client/Client/Updater/UpdaterService.cs:271
[Critical][00:00:12.9595770] ClientApp:AppDomain.UnhandledException (ConfigureLogging): exception: System.Exception: Could not initialize an instance of the type 'Foundation.NSUrl': the native 'initWithString:' method returned nil.
It is possible to ignore this condition by setting MonoTouch.ObjCRuntime.Class.ThrowOnInitFailure to false.
  at Foundation.NSObject.InitializeHandle (System.IntPtr handle, System.String initSelector) [0x000ad] in <87136c6c6f2e41eea18d0a86c05d1f2e>:0
  at Foundation.NSUrl..ctor (System.String urlString) [0x00042] in <87136c6c6f2e41eea18d0a86c05d1f2e>:0
  at Xamarin.Interactive.Client.Mac.AppDelegate.OpenFile (AppKit.NSApplication sender, System.String filename) [0x00005] in <2c159cff54f347b694a007fc3c243c40>:0
  at (wrapper managed-to-native) AppKit.NSApplication:NSApplicationMain (int,string[])
  at AppKit.NSApplication.Main (System.String[] args) [0x0003d] in <87136c6c6f2e41eea18d0a86c05d1f2e>:0
  at Xamarin.Interactive.Client.Mac.Entry.Main (System.String[] args) [0x0003d] in <2c159cff54f347b694a007fc3c243c40>:0  @ /Users/builder/vsts/_work/11/s/Clients/Xamarin.Interactive.Client/ClientApp.cs:196
[ERROR] FATAL UNHANDLED EXCEPTION: System.Exception: Could not initialize an instance of the type 'Foundation.NSUrl': the native 'initWithString:' method returned nil.
It is possible to ignore this condition by setting MonoTouch.ObjCRuntime.Class.ThrowOnInitFailure to false.
  at Foundation.NSObject.InitializeHandle (System.IntPtr handle, System.String initSelector) [0x000ad] in <87136c6c6f2e41eea18d0a86c05d1f2e>:0
  at Foundation.NSUrl..ctor (System.String urlString) [0x00042] in <87136c6c6f2e41eea18d0a86c05d1f2e>:0
  at Xamarin.Interactive.Client.Mac.AppDelegate.OpenFile (AppKit.NSApplication sender, System.String filename) [0x00005] in <2c159cff54f347b694a007fc3c243c40>:0
  at (wrapper managed-to-native) AppKit.NSApplication:NSApplicationMain (int,string[])
  at AppKit.NSApplication.Main (System.String[] args) [0x0003d] in <87136c6c6f2e41eea18d0a86c05d1f2e>:0
  at Xamarin.Interactive.Client.Mac.Entry.Main (System.String[] args) [0x0003d] in <2c159cff54f347b694a007fc3c243c40>:0

[sandyarmstrong]

I saw this on both 10.12.6 and 10.13.1.

[sandyarmstrong]

and 10.13.2.