Object reference not set to an instance of an object error when regenerating a planet

SEToolbox Version: 1.189.33
SE Version: 1.190

SEToolbox crashed

---What were you doing with SEToolbox when it happened?---
Regenerating a planet. I want to change the radius of it, but the feature is broken.

Steps to Reproduce

1. Open a save with a planet.
2. Click "Regenerate"
3. Do something. Or don't, it doesn't matter.
4. Click "OK"
5. Crash.

SEToolbox Event Log

2019-04-14 23:11:31,277 [1] FATAL SEToolbox.Support.DiagnosticsLogging [(null)] - Unhandled Exception
Application: C:\Program Files (x86)\MidSpace\SEToolbox\SEToolbox.exe
CommandLine: "C:\Program Files (x86)\MidSpace\SEToolbox\SEToolbox.exe" /B /B
CurrentDirectory: C:\Program Files (x86)\MidSpace\SEToolbox
SEBinPath: C:\Program Files (x86)\Steam\SteamApps\common\SpaceEngineers\Bin64
SEBinVersion: 1.190.9
ProcessorCount: 12
OSVersion: Microsoft Windows NT 6.2.9200.0
Version: 4.0.30319.42000
Is64BitOperatingSystem: True
IntPtr.Size: 8
IsAdmin: False
CurrentUICulture: en-US
CurrentCulture: 
Times started total: 6
Times started since last reset: 6
Times started since game update: 6

Files:
2019-04-09T17:18:07.9520735-04:00	25,089,208		HavokWrapper.dll
2017-06-02T08:49:12.0000000-04:00	498,176	2014.2.17.1	HelixToolkit.Wpf.dll
2017-03-08T18:26:22.0000000-05:00	276,480	2.0.8.0	log4net.dll
2019-03-10T21:58:02.9556656-04:00	660,128	12.00.21005.1 built by: REL	msvcp120.dll
2019-03-10T21:58:02.9566631-04:00	963,232	12.00.21005.1 built by: REL	msvcr120.dll
2018-09-09T01:31:30.0000000-04:00	911,360	0.32.0.0	Octokit.dll
2019-04-09T17:18:11.8904976-04:00	73,912	1.0.0.0	Sandbox.Common.dll
2019-04-09T17:18:07.9550481-04:00	7,513,784	1.0.0.0	Sandbox.Game.dll
2019-04-09T17:18:07.9560406-04:00	392,376	1.0.0.0	Sandbox.Graphics.dll
2019-04-09T17:18:11.9257138-04:00	20,664	1.0.0.0	Sandbox.RenderDirect.dll
2019-03-01T05:56:52.0000000-05:00	1,323,008	01.189.33.1	SEToolbox.exe
2017-06-02T08:49:12.0000000-04:00	745		SEToolbox.exe.config
2019-03-01T05:56:48.0000000-05:00	62,464	1.0.0.0	SEToolbox.ImageLibrary.dll
2019-03-01T05:56:48.0000000-05:00	7,680	1.0.0.0	SEToolbox.ImageShaders.dll
2019-03-01T05:56:52.0000000-05:00	2,248,192		SEToolbox.pdb
2019-03-01T05:56:48.0000000-05:00	53,248	1.0.0.0	SEToolboxUpdate.exe
2019-04-09T17:18:07.9565372-04:00	487,608	3.1.0	SharpDX.Direct2D1.dll
2019-04-09T17:18:07.9570325-04:00	286,904	3.1.0	SharpDX.Direct3D11.dll
2019-04-09T17:18:07.9580250-04:00	268,472	3.1.0	SharpDX.dll
2019-04-09T17:18:11.9441073-04:00	138,424	3.1.0	SharpDX.DXGI.dll
2019-04-09T17:18:07.9590165-04:00	485,048	1.0.0.0	SpaceEngineers.Game.dll
2019-04-09T17:18:11.9515049-04:00	62,136	1.0.0.0	SpaceEngineers.ObjectBuilders.dll
2019-04-09T17:18:07.9590165-04:00	5,076,152	1.0.0.0	SpaceEngineers.ObjectBuilders.XmlSerializers.dll
2019-04-09T17:18:07.9595132-04:00	327,864	11.0.0	Steamworks.NET.dll
2019-03-10T21:58:43.5561071-04:00	250,656	04.28.51.07	steam_api64.dll
2019-04-09T17:18:07.9605052-04:00	322,232	1.0.102.0	System.Data.SQLite.dll
2013-03-09T17:25:10.0000000-05:00	39,936	2.0.20525.0	System.Windows.Interactivity.dll
2019-04-09T17:18:11.9549776-04:00	21,688	1.0.0.0	VRage.Ansel.dll
2019-04-09T17:18:11.9805855-04:00	65,208	1.0.0.0	VRage.Audio.dll
2019-04-09T17:18:07.9610010-04:00	486,072	1.0.0.0	VRage.dll
2019-04-09T17:18:07.9614968-04:00	1,348,280	1.0.0.0	VRage.Game.dll
2019-04-09T17:18:07.9619930-04:00	7,312,568	1.0.0.0	VRage.Game.XmlSerializers.dll
2019-04-09T17:18:12.1944622-04:00	92,344	1.0.0.0	VRage.Input.dll
2019-04-09T17:18:07.9624888-04:00	713,912	1.0.0.0	VRage.Library.dll
2019-04-09T17:18:07.9629845-04:00	542,904	1.0.0.0	VRage.Math.dll
2019-04-09T17:18:12.1979340-04:00	204,984		VRage.Native.dll
2019-04-09T17:18:12.2043827-04:00	93,880	1.0.0.0	VRage.OpenVRWrapper.dll
2019-04-09T17:18:07.9634808-04:00	341,688	1.0.0.0	VRage.Render.dll
2019-04-09T17:18:07.9639765-04:00	914,616	1.0.0.0	VRage.Render11.dll
2018-03-27T15:51:20.0000000-04:00	77,824	3.0.1.0	WPFLocalizeExtension.dll
2018-01-08T20:35:48.0000000-05:00	27,648	1.2.2	XAMLMarkupExtensions.dll

System.NullReferenceException: Object reference not set to an instance of an object.
   at Sandbox.Engine.Voxels.MyPlanetStorageProvider.Init(Int64 seed)
   at Sandbox.Engine.Voxels.MyPlanetStorageProvider.Init(Int64 seed, MyPlanetGeneratorDefinition generator, Double radius)
   at SEToolbox.Models.StructurePlanetModel.RegeneratePlanet(Int32 seed, Single radius) in D:\Development\GitHub\SEToolbox\Main\SEToolbox\SEToolbox\Models\StructurePlanetModel.cs:line 385
   at SEToolbox.ViewModels.StructurePlanetViewModel.RegenerateExecuted() in D:\Development\GitHub\SEToolbox\Main\SEToolbox\SEToolbox\ViewModels\StructurePlanetViewModel.cs:line 185
   at SEToolbox.Services.DelegateCommand.Execute() in D:\Development\GitHub\SEToolbox\Main\SEToolbox\SEToolbox\Services\DelegateCommand.cs:line 72
   at SEToolbox.Services.DelegateCommand.System.Windows.Input.ICommand.Execute(Object parameter) in D:\Development\GitHub\SEToolbox\Main\SEToolbox\SEToolbox\Services\DelegateCommand.cs:line 154
   at MS.Internal.Commands.CommandHelpers.CriticalExecuteCommandSource(ICommandSource commandSource, Boolean userInitiated)
   at System.Windows.Controls.MenuItem.InvokeClickAfterRender(Object arg)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)

Start in Models/StructurePlanetModel.cs at line 385, where RegeneratePlanet calls MyPlanetStorageProvider.Init, then trace the command from ViewModels/StructurePlanetViewModel.cs line 185. Reproduce the crash using the listed regeneration steps and verify that regenerating a planet completes without the NullReferenceException.