vanilla variant error

Involved Harmony IDs: vanvar
System.NullReferenceException: Object reference not set to an instance of an object.
   at VanillaVariants.BlockAngledGears_OnNeighbourBlockChange_Patch.Prefix(BlockAngledGears __instance, IWorldAccessor world, BlockPos pos, BlockPos neibpos) in C:\Users\dana_\Source\Repos\Craluminum-Mods\VanillaVariants\VanillaVariants\src\Systems\HarmonyPatches\Mechanics\BlockAngledGears_OnNeighbourBlockChange_Patch.cs:line 46
   at Vintagestory.GameContent.Mechanics.BlockAngledGears.OnNeighbourBlockChange_Patch1(BlockAngledGears this, IWorldAccessor world, BlockPos pos, BlockPos neibpos)
   at Vintagestory.Client.NoObf.ClientMain.TriggerNeighbourBlocksUpdate(BlockPos pos) in VintagestoryLib\Client\ClientMain.cs:line 3267
   at Vintagestory.Client.NoObf.ClientMain.OnPlayerTryDestroyBlock(BlockSelection blockSelection) in VintagestoryLib\Client\ClientMain.cs:line 1713
   at Vintagestory.Client.NoObf.SystemMouseInWorldInteractions.HandleMouseInteractionsBlockSelected(Single dt) in VintagestoryLib\Client\Systems\Player\MouseInWorldInteractions.cs:line 617
   at Vintagestory.Client.NoObf.SystemMouseInWorldInteractions.OnFinalizeFrame(Single dt) in VintagestoryLib\Client\Systems\Player\MouseInWorldInteractions.cs:line 85
   at Vintagestory.Client.NoObf.ClientEventManager.TriggerRenderStage(EnumRenderStage stage, Single dt) in VintagestoryLib\Client\Util\ClientEventManager.cs:line 188
   at Vintagestory.Client.NoObf.ClientMain.RenderToDefaultFramebuffer(Single dt) in VintagestoryLib\Client\ClientMain.cs:line 992
   at Vintagestory.Client.GuiScreenRunningGame.RenderToDefaultFramebuffer(Single dt) in VintagestoryLib\Client\MainMenu\Screens\GuiScreenRunningGame.cs:line 242
   at Vintagestory.Client.ScreenManager.Render(Single dt) in VintagestoryLib\Client\ScreenManager.cs:line 695
   at Vintagestory.Client.ScreenManager.OnNewFrame(Single dt) in VintagestoryLib\Client\ScreenManager.cs:line 670
   at Vintagestory.Client.NoObf.ClientPlatformWindows.window_RenderFrame(FrameEventArgs e) in VintagestoryLib\Client\ClientPlatform\GameWindow.cs:line 92
   at OpenTK.Windowing.Desktop.GameWindow.Run()
   at Vintagestory.Client.ClientProgram.Start(ClientProgramArgs args, String[] rawArgs) in VintagestoryLib\Client\ClientProgram.cs:line 334
   at Vintagestory.Client.ClientProgram.<>c__DisplayClass10_0.<.ctor>b__1() in VintagestoryLib\Client\ClientProgram.cs:line 130
   at Vintagestory.ClientNative.CrashReporter.Start(ThreadStart start) in VintagestoryLib\Client\ClientPlatform\ClientNative\CrashReporter.cs:line 93