Error：NullReferenceException: Object reference not set to an instance of an object

[yelandiealma]

• Unity 2022
• VRC SDK 3.5.1
• Make It MMD 1.0.0
• NDMF 1.3.7
• MA 1.9.8
• apper when i put MakeItMMD prefab on avatar, prefab is from another project.

  System.NullReferenceException: Object reference not set to an instance of an object
  at enitimeago.NonDestructiveMMD.vendor.BlendShapeCombiner.Editor.Helper.GetPosedVertices (UnityEngine.SkinnedMeshRenderer skin, UnityEngine.Mesh sharedMesh) [0x002e4] in .\Packages\enitimeago.non-destructive-mmd\Editor\vendor\CombinerHelper.cs:152 
  at enitimeago.NonDestructiveMMD.vendor.BlendShapeCombiner.Editor.CombinerImpl.MergeBlendShapes (enitimeago.NonDestructiveMMD.vendor.BlendShapeCombiner.BlendShapeCombiner p) [0x0013e] in .\Packages\enitimeago.non-destructive-mmd\Editor\vendor\CombinerImpl.cs:102 
  at enitimeago.NonDestructiveMMD.BlendShapeMappingsPass.Execute (UnityEngine.GameObject avatarRootObject) [0x002c3] in .\Packages\enitimeago.non-destructive-mmd\Editor\BlendShapeMappingsPass.cs:102 
  at enitimeago.NonDestructiveMMD.BlendShapeMappingsPass.Execute (nadena.dev.ndmf.BuildContext context) [0x00000] in .\Packages\enitimeago.non-destructive-mmd\Editor\BlendShapeMappingsPass.cs:19 
  at nadena.dev.ndmf.Pass`1[T].nadena.dev.ndmf.IPass.Execute (nadena.dev.ndmf.BuildContext context) [0x00000] in .\Packages\nadena.dev.ndmf\Editor\API\Fluent\Pass.cs:64 
  at nadena.dev.ndmf.ConcretePass.Execute (nadena.dev.ndmf.BuildContext context) [0x00000] in .\Packages\nadena.dev.ndmf\Editor\API\Solver\PluginResolver.cs:36 
  at nadena.dev.ndmf.BuildContext.RunPass (nadena.dev.ndmf.ConcretePass pass) [0x00124] in .\Packages\nadena.dev.ndmf\Editor\API\BuildContext.cs:337 
  at enitimeago.NonDestructiveMMD.vendor.BlendShapeCombiner.Editor.Helper.GetPosedVertices (UnityEngine.SkinnedMeshRenderer skin, UnityEngine.Mesh sharedMesh) [0x002e4] in .\Packages\enitimeago.non-destructive-mmd\Editor\vendor\CombinerHelper.cs:152 
  at enitimeago.NonDestructiveMMD.vendor.BlendShapeCombiner.Editor.CombinerImpl.MergeBlendShapes (enitimeago.NonDestructiveMMD.vendor.BlendShapeCombiner.BlendShapeCombiner p) [0x0013e] in .\Packages\enitimeago.non-destructive-mmd\Editor\vendor\CombinerImpl.cs:102 
  at enitimeago.NonDestructiveMMD.BlendShapeMappingsPass.Execute (UnityEngine.GameObject avatarRootObject) [0x002c3] in .\Packages\enitimeago.non-destructive-mmd\Editor\BlendShapeMappingsPass.cs:102 
  at enitimeago.NonDestructiveMMD.BlendShapeMappingsPass.Execute (nadena.dev.ndmf.BuildContext context) [0x00000] in .\Packages\enitimeago.non-destructive-mmd\Editor\BlendShapeMappingsPass.cs:19 
  at nadena.dev.ndmf.Pass`1[T].nadena.dev.ndmf.IPass.Execute (nadena.dev.ndmf.BuildContext context) [0x00000] in .\Packages\nadena.dev.ndmf\Editor\API\Fluent\Pass.cs:64 
  at nadena.dev.ndmf.ConcretePass.Execute (nadena.dev.ndmf.BuildContext context) [0x00000] in .\Packages\nadena.dev.ndmf\Editor\API\Solver\PluginResolver.cs:36 
  at nadena.dev.ndmf.BuildContext.RunPass (nadena.dev.ndmf.ConcretePass pass) [0x00124] in .\Packages\nadena.dev.ndmf\Editor\API\BuildContext.cs:337 

[enitimeago]

Thank you for the report!

I've received a similar report on Twitter: https://twitter.com/SsuroVRC/status/1768259546190114984

This appears to be triggered when more than one blendshape is selected for any MMD morph. I haven't been able to reproduce this with avatars I normally use.

Looking at the stack trace, the problem appears to be related to bones existing on the face's SkinnedMeshRenderer?

I need to find a repro case.

[enitimeago]

@yelandiealma May I ask what avatar you encountered this error with?

[enitimeago]

It seems like it's possible for a SkinnedMeshRenderer's bones to contain null, which was encountered by UniVRM too https://twitter.com/MobileHackerz/status/1280788469384536064 https://github.com/vrm-c/UniVRM/issues/467

I'll release a new alpha version with a patch for this.

[enitimeago]

@yelandiealma I've released 1.1.0-alpha.2, you can find the .unitypackage here or add my unstable VPM repository here.

Could you please try and let me know if it fixes the issue?

[yelandiealma]

oops, i went to sleep at that time, sorry. it work! thany you 🫶

[enitimeago]

Thank you for letting me know! If you have the time, could you let me know the avatar you encountered the error with, and whether the avatar's face mesh was modified (for example in Blender)? I'd like to find out how this error can be reproduced myself if possible.

[yelandiealma]

I use 右近弐式 with Face Tracking Module The strange thing is that when I reopened a new project and performed the same steps, the bug did not appear. My friend also triggered this bug, he uses Shinra, but his bug is triggered when selecting multiple blendshape in the same mmd expression, same as above. when he modified it from scratch, the error didn't appear either. so strange....

[enitimeago]

Ah great, I have Shinra, so I'll try doing some testing. If you can find out whether your friend also has modified Shinra's face mesh or has gimmicks that might modify the face mesh please let me know. Yeah, that's strange... thank you for the extra information!