NRE when file externally added

[mhutch]

ERROR [2018-04-30 15:17:43Z]: An unhandled exception has occured. Terminating MonoDevelop? False
System.NullReferenceException: Object reference not set to an instance of an object
  at MonoDevelop.Projects.MSBuild.DefaultMSBuildEngine+<FindGlobItemsIncludingFile>d__85.MoveNext () [0x00039] in /Users/mikayla/code/monodevelop/main/src/core/MonoDevelop.Core/MonoDevelop.Projects.MSBuild/DefaultMSBuildEngine.cs:1441 
  at System.Linq.Enumerable+WhereEnumerableIterator`1[TSource].MoveNext () [0x0004e] in /Users/builder/jenkins/workspace/build-package-osx-mono/2018-02/external/bockbuild/builds/mono-x64/external/corefx/src/System.Linq/src/System/Linq/Where.cs:140 
  at MonoDevelop.Projects.Project.OnFileCreatedExternally (System.String fileName) [0x000ee] in /Users/mikayla/code/monodevelop/main/src/core/MonoDevelop.Core/MonoDevelop.Projects/Project.cs:4293 
  at MonoDevelop.Projects.Project+<>c__DisplayClass338_0.<OnFileCreated>b__0 () [0x00001] in /Users/mikayla/code/monodevelop/main/src/core/MonoDevelop.Core/MonoDevelop.Projects/Project.cs:4258 
  at MonoDevelop.Core.Runtime+<>c.<RunInMainThread>b__39_0 (System.Object state) [0x00015] in /Users/mikayla/code/monodevelop/main/src/core/MonoDevelop.Core/MonoDevelop.Core/Runtime.cs:337 
WARNING [2018-04-30 15:17:43Z]: File created externally not processed. /Users/mikayla/code/t4/TextTransform/obj/7d5f6230-9150-4f7c-a224-8d6ac478bbe1.tmp

VS bug #611795

[xamarin-release-manager]

[sync] [VS-18] Comment by xamarinc

Fixed in version 8.6.0.802 (master)

Pull Request #5046 merged by: Matt Ward
Author: mono
Commit: 34fcedc (xamarin/monodevelop)