Roon core on macOS Big Sur 11.0.1: Object reference not set to an instance of an object

Core Machine (Operating system/System info/Roon build number)

macOS Big Sur 11.0.1
Roon v1.7 (build 667) stable on macosx

Network Details (Including networking gear model/manufacturer and if on WiFi/Ethernet)

Cabled connection, 1 Gbit

Audio Devices (Specify what device you’re using and its connection type - USB/HDMI/etc.)

Probably not relevant for this issue, as it happens at start, but:
Chord Mojo on USB on Mac
CocktailAUDIO N15D on cabled network.

Description Of Issue

I have Roon starting automatically at login.
When it starts, almost always I would say, I get a pop up with the following error:

Object reference not set to an instance of an object

I have seen many topics in the community forum with the same error, but non matching exactly my behaviour.

In my case, if restart Roon, it always works.
It is just something happening the first time it opens, not sure if it is related to the fact that it starts automatically at login, or it would do the same starting it manually.

If I search for the error in the log file, these are the lines before and after it:

12/05 08:29:41 Warn: could not run /usr/sbin/diskutil info -plist '/Volumes/.timemachine/0753BAF4-93A8-4709-861E-005FFA4949B3/2020-11-20-213015.backup' -- Exit code was: 1
12/05 08:29:41 Error: Exception while mapping file: System.IO.IOException: Could not open file
  at System.IO.MemoryMappedFiles.MemoryMapImpl.OpenFile (System.String path, System.IO.FileMode mode, System.String mapName, System.Int64& capacity, System.IO.MemoryMappedFiles.MemoryMappedFileAccess access, System.IO.MemoryMappedFiles.MemoryMappedFileOptions options) [0x00060] in <4e6264df2b1e46abbbebf065ddc4da2d>:0 
  at System.IO.MemoryMappedFiles.MemoryMappedFile.CreateFromFile (System.String path, System.IO.FileMode mode, System.String mapName, System.Int64 capacity, System.IO.MemoryMappedFiles.MemoryMappedFileAccess access) [0x00056] in <4e6264df2b1e46abbbebf065ddc4da2d>:0 
  at Base.Utils+MappedFileCache+MappedFile..ctor (System.String filePath, System.IO.FileStream fileStream) [0x00025] in <27a374e1b6134c97b15591dcf08dbcd9>:0 
12/05 08:29:41 Error: Exception while loading texture from file ui_atlas@2x-2.png: System.NullReferenceException: Object reference not set to an instance of an object
  at Broo.Engine.OpenGlTexture.LoadResourceFullSync (Broo.Engine.DeviceTarget target, System.String resourceName, System.Nullable`1[T] txwidth, System.Nullable`1[T] txheight, System.Boolean smooth, System.Boolean wrap, System.Boolean genMipmaps, System.Boolean premultiplied, System.Boolean srgbEncoded, Broo.Engine.Engine+TextureNewDelegate newtexturecb, Broo.Engine.Engine+TextureLoadedDelegate loadcb) [0x0000e] in <6a0c64b018414c41be4eb856a62b70b7>:0 
12/05 08:29:41 Trace: [brooengine] Loaded atlas texture ui_atlas@2x-2.png. 42ms
12/05 08:29:41 Warn: System.NullReferenceException: Object reference not set to an instance of an object
  at Broo.Engine.LoadContext.LoadAtlas (System.String atlasname, System.Func`2[T,TResult] open_file) [0x002a5] in <6a0c64b018414c41be4eb856a62b70b7>:0 
  at Broo.Engine.LoadContext.LoadAtlasByName (System.String atlasname) [0x00000] in <6a0c64b018414c41be4eb856a62b70b7>:0 
  at Broo.BrooLoader.Load (System.Boolean rendertrace, System.String brooxfile, System.String bindingsdllfile, System.String atlasname, Broo.Engine.Engine& engine, Broo.Engine.Window& window, Broo.Engine.LoadContext& loadcontext, System.String& err) [0x001c7] in <6a0c64b018414c41be4eb856a62b70b7>:0 
  at Sooloos.Application.Main (System.String[] argv) [0x002d5] in <7c0bc92db47342b49409e9e862387d51>:0 

When it starts correctly, I see errors regarding not being able to run “diskutil info”, but no error like “Could not open file” and the log does not contain the word “reference” at all.

For info, I’ve recently replaced the spinning drive in my iMac with a Sata SSD, but I had the error before and after the update. To be honest, I’m not sure if I saw the error before upgrading to macOS Big Sur or it is something that came out only after it.

Any idea?


1 Like


Hello @Francesco, could you please use the directions found here and send us over a set of logs using a shared Dropbox link.

Hi Nuwriy,

I’ve sent you a link to the logs via private message.
Let me now if you need anything else or if I should do any more tests.


Hello @Francesco, and thanks for the logs! I’ve passed them over to our QA team for further analysis and will return with their feedback!

Hello @Francesco, and thanks for your patience while I discussed this thread with the team. Our QA team recommended disabling “open on login” for this device and seeing if the issue continued. If it does, could you please provide the steps you took to reproduce the issue? Thanks!

Thanks Nuwriy,

I’ll try and let you know if the problem happens again without the automatic login.



I seem to have this problem, on a similar installation (MAC with Big Sur) and it happens when manually starting room (e.g. after a reboot, I do not start at login). The second time after the crash it works, so it is just a nuisance non a big problem,

Cheers Roberto

similar problem as Roberto_Carlin.
Roon Remote 1.7 (built 710) on BigSur 11.1. MacBook Pro (13-inch, 2017).
No attached devices, just 2 mapped SMB folders from the same NAS.

I have the same problem (Roon Remote 1.7(710) on Big Sur 11.2): when I log on to my Mac, the previously launched Roon starts automatically, and at the same time an error occurs.
The second time I start Roon Remote, there is no problem.

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