TextMesh Pro TMPro SubMeshUI Error when changing scenes

My game recently updated to Unity 2019.4.28f1 and we added the latest TMPro 2.1.6 as well. What we have noticed is that we have been getting a lot of errors from SubMeshUI when leaving a scene but it's hard to reproduce and I haven't been able to reproduce it but my game gets 5000 errors a day. So it's basically when we open a scene and that scene contains a fallback character. When exiting the scene the error occurs.
In my code we also do a specific Destroy certain GameObjects that has been Instantiated when leaving the scene. But even if I remove this part it seems to occur.

Errors

Code (CSharp):

1. TMPro.TMP_SubMeshUI.UpdateMaterial () (at <00000000000000000000000000000000>:0)
2. TMPro.TMP_SubMeshUI.SetMaterialDirty () (at <00000000000000000000000000000000>:0)
3. UnityEngine.UI.MaskableGraphic.OnDisable () (at <00000000000000000000000000000000>:0)
4. TMPro.TMP_SubMeshUI.OnDisable () (at <00000000000000000000000000000000>:0)

By checking the code part it can be easily fixed with adding a null check for the fontsharedMaterial in UpdateMaterial but I was wondering why this might be occurring anyway?

Code (CSharp):

1.             if (m_sharedMaterial.HasProperty(ShaderUtilities.ShaderTag_CullMode))
2.             {
3.                 if (textComponent.fontSharedMaterial)
4.                 {
5.                     float cullMode = textComponent.fontSharedMaterial.GetFloat(ShaderUtilities.ShaderTag_CullMode);
6.                     m_sharedMaterial.SetFloat(ShaderUtilities.ShaderTag_CullMode, cullMode);
7.                 }
8.             }

Any help would be much appreciated.

 

I changed a lot in the Unity update but I searched all the scenes to remove all submeshui and updated all the serialization in my scenes. Most of the text get set in code so it creates a submesh during runtime.

It might have something to do with unloading FontAssets between scene switches but I do a comparison between the scenes to check what assets are to remain so that I don't reload used AssetBundle files.

* Upon checking if my FontAssets and FontAsset materials get unloaded or not. They remain when switching scenes since they are in the next scene as well.

 

I can get a somewhat resembling error but not entirely like our players so I'll give you an example later today when I get some time. Thank you for the quick response.

 

@Stephan_B

I managed to create a simple project that reproduces it in the only way I currently know. AssetBundle.UnloadAllAssetBundles(true) will cause the Exception upon exiting an Assetbundle scene.

Project added in post

1. Open Start scene
2. Press Initialize button then select whatever scene you want to go to.
3. Then press the return to Start button and the error occurs.

While my players are experiencing this error when getting another error and chooses to reboot to the first scene. When switching between scenes which most of my players are experiencing are somewhat similar but unloading assets in between scenes. I have not managed to reproduce this yet in editor nor game and other testers has not been able to reproduce this yet. But it ought to have something todo with AssetBundle.Unload function. Even though I'm not unloading the FontAsset nor Material but for some reason players gets the error.

*I made it with 2019.4.14f1 but newer version also causes it. I'm mainly working on 2019.4.28f1

Hope this helps.

 

Thank you. I look forward to your response.

 

@Stephan_B
I updated the game this week with a new release by adding the null check and all errors disappeared from the game and people don't seem to report any problems within the game so far. Just would like to update you on that with this. I will keep this part for now until you have found a proper solution.

 

Is this an unresolved issue yet?
Still having the same problem as above.

Reported to Firebase Crashlytics. (iOS only)
Non-fatal Exception: NullReferenceException
0 ??? 0x0 UpdateMaterial (TMPro.TMP_SubMeshUI)
1 ??? 0x0 SetMaterialDirty (TMPro.TMP_SubMeshUI)
2 ??? 0x0 OnDisable (UnityEngine.UI.MaskableGraphic)
3 ??? 0x0 OnDisable (TMPro.TMP_SubMeshUI)

Unity: 2021.1.11f1
TextMeshPro: 3.0.6

 

@Stephan_B Still seeing this too (Crashlytics only):

Code (CSharp):

1. Non-fatal Exception: java.lang.Exception: NullReferenceException : Object reference not set to an instance of an object.
2.        at TMPro.TMP_SubMeshUI.UpdateMaterial(TMPro.TMP_SubMeshUI)
3.        at TMPro.TMP_SubMeshUI.SetMaterialDirty(TMPro.TMP_SubMeshUI)
4.        at UnityEngine.UI.MaskableGraphic.OnDisable(UnityEngine.UI.MaskableGraphic)
5.        at TMPro.TMP_SubMeshUI.OnDisable(TMPro.TMP_SubMeshUI)

Unity: 2020.3.26f1
TMP: 3.0.6
Build Target: Android

 

Code (CSharp):

1. Object reference not set to an instance of an object
2.  
3. TMPro.TMP_SubMeshUI.UpdateMaterial () (at <00000000000000000000000000000000>.0)
4. TMPro.TMP_SubMeshUI.SetMaterialDirty () (at <00000000000000000000000000000000>.0)
5. UnityEngine.UI.MaskableGraphic.OnDisable () (at <00000000000000000000000000000000>.0)
6. TMPro.TMP_SubMeshUI.OnDisable () (at <00000000000000000000000000000000>.0)

Unity: 2020.3.16f1
TMP: 3.0.6
Build Target: Android

@Stephan_B Still seeing this too

 

Faced same issue... just kinda cropped up. I updated to 3.2.0 and it still persists:

Code (CSharp):

1. NullReferenceException: Object reference not set to an instance of an object
2. TMPro.TMP_SubMeshUI.UpdateMaterial () (at Library/PackageCache/com.unity.textmeshpro@3.2.0-pre.3/Scripts/Runtime/TMP_SubMeshUI.cs:710)
3. TMPro.TMP_SubMeshUI.SetMaterialDirty () (at Library/PackageCache/com.unity.textmeshpro@3.2.0-pre.3/Scripts/Runtime/TMP_SubMeshUI.cs:617)
4. UnityEngine.UI.MaskableGraphic.OnValidate () (at Library/PackageCache/com.unity.ugui@1.0.0/Runtime/UI/Core/MaskableGraphic.cs:202)

I also tried going to 4.0, but that was a nightmare since
TMP_FontAsset
was missing.

 

I am facing the same issue (I think it is?) in Unity 2020.3.5f1 with TMP 3.0.6 (was unable to try with 3.2.0-pre.3):

Code (CSharp):

1. Material 'NotoSansJP-Bold SDF Material' with Shader 'TextMeshPro/Distance Field' doesn't have a float or range property '_CullMode'
2. UnityEngine.Material:GetFloat (string)
3. TMPro.TMP_SubMeshUI:UpdateMaterial () (at Library/PackageCache/com.unity.textmeshpro@3.0.6/Scripts/Runtime/TMP_SubMeshUI.cs:710)
4. TMPro.TMP_SubMeshUI:SetMaterialDirty () (at Library/PackageCache/com.unity.textmeshpro@3.0.6/Scripts/Runtime/TMP_SubMeshUI.cs:617)
5. UnityEngine.UI.MaskableGraphic:OnDisable ()
6. TMPro.TMP_SubMeshUI:OnDisable () (at Library/PackageCache/com.unity.textmeshpro@3.0.6/Scripts/Runtime/TMP_SubMeshUI.cs:286)

My findings:

• Scene change triggers the problem
• I can reproduce the issue with 100% consistency in the editor, but in build version the issue doesn't happen
• I am using I2 Localization asset to handle text localization and switching the font assets/materials
• For me the issue happens when I switch from English font asset to Japanese before the scene change. The issue does not happen if the game starts with Japanese selected. It also does not happen if I switch from Russian font asset to Japanese. I assume the specific languages are not important, but somehow their respective font assets differ in this.
• I was unable to try this with version 3.2.0-pre.3 as I got another error (Library\PackageCache\com.unity.textmeshpro@3.2.0-pre.3\Scripts\Editor\TMP_FontAssetEditor.cs(2005,77): error CS1503: Argument 2: cannot convert from 'string' to 'int')

 

Looks like we have the same issue in our builds. It happened first time for us. We load Fonts and Materials from Addressables. Haven't found why it happens yet.
We are also using i2 Localization but we are not changing materials.
After restarting the game issue got fixed.

[Update]
Found source of the issue. At least I think so.
We are loading fonts and materials from addressables to avoid duplicated and when doing game reset we probably had null material references. So I needed to clean material references when resetting progress in the game. But I'm not 100% sure with this.

Unity: 2021.3.4
TMP: 3.2.0-pre.3
Build Target: iOS

 

bump, it is not fixed yet

 

bump, also having this issue. Seems to be caused by AssetBundle.UnloadAllAssetBundles(true), which is critical to our project.

 

No repro but I wrote simple hack to remove all errors in Firebase Console and Unity Crash logs:

private void ReleaseTextMeshPro()
{
var objs = GameObject.FindObjectsOfType(typeof(GameObject), true).Cast<GameObject>()
.Where(o => o.transform.parent == null).ToList();
var comps = objs.SelectMany(o => o.GetComponentsInChildren<TMP_SubMeshUI>(true)).ToArray();

Debug.Log("[GameEntryPoint] Found TMP_SubMeshUI : " + comps.Length);

foreach (TMP_SubMeshUI m in comps)
{
if (m == null) continue;
Debug.Log("[GameEntryPoint] Found " + m.gameObject.GetPath());
GameObject.DestroyImmediate(m.gameObject);
}

}

And I launch this method in MonoBehaviour.OnApplicationQuit() callback

PS All prefabs with TMP_SubMeshUI are prefabs loaded from Asset Bundle with TMP Text with TMP_Sprite_Asset (icon in text), each icon adds one additional exception if stays in game during quitting

 

I see TMP instances sitting under a Mask trigger those exception if I start changibg scene.

 

Hey, I'm having the same issue.



Any fixes available for this outside of changing the package yourself?

I'm on Unity 2021.3.4f1. Running on a M1 MacBook Pro on macOS Monterey 12.6, however, it's also reproducible on my Windows machine.

This happens when I try to release a Prefab loaded with Addressables. The prefab contains a TMP object with rich text containing a sprite.

Edit: As discussed above this is easily fixed by adding a null check in TMP_SubMeshUI.UpdateMaterial like so:

Code (CSharp):

1. if (m_sharedMaterial.HasProperty(ShaderUtilities.ShaderTag_CullMode))
2. {
3.     if (textComponent.fontSharedMaterial != null)
4.     {
5.         float cullMode = textComponent.fontSharedMaterial.GetFloat(ShaderUtilities.ShaderTag_CullMode);
6.         m_sharedMaterial.SetFloat(ShaderUtilities.ShaderTag_CullMode, cullMode);
7.     }
8. }

That will at least solve the runtime error. But it'd be great to know why the shared material is null to begin with.

I would just edit the package, but I can't really do that since it just reverts any local changes when I change them.

 

@Stephan_B Is there as update to this, or some issue tracker I can track to get some info on a potential fix for this?

It happens for me consistently every time I just disable the gameObject that is owning a TMP_Text component with rich text enabled & contains sprites when that object is a child if an instantiated prefab which was loaded from an Asset Bundle. Same goes if I destroy the root object.

EDIT: I'm on Unity 2021.3.4f1

 

@Stephan_B
Before on 2019.4.28f1 I fix this by switching the TMP_SubMeshUI with my own fixed class and it worked and I had been using it until this was fixed. But yesterday I updated the game to 2020.3.38f1 and my replacement scripts works but right after I replace the file, Unity's package manager forcefully rebuilds all packages... Now I'm back with 500~1000 errors a day because of this.

Code (CSharp):

1. The package cache was invalidated and rebuilt because the following immutable asset(s) were unexpectedly altered:
2.   Packages/com.unity.textmeshpro/Scripts/Runtime/TMP_SubMeshUI.cs

I added the latest preview package but this fix has still not been implemented. Any time limit on this fix?

*Update*
I failed to update the file by replacing it so I ended up embedding TMP package so that it becomes a custom package. Which now I can freely change TMP_SubMeshUI and build it with no problem. I will do this for now.

 

Would be great to have a fix for this. As it stands it looks like we'll need to fork our own version in order to avoid this issue.

 

Any Updates?

Bump @Stephan_B

 

Thanks for the changes. When it leaves preview I will update the project.