Null reference exception when opening window in unity 6.3

[ksx-kshan]

When opening the coplay window in unity 6.3 I see tons of console spam and nothing works.

Error

NullReferenceException: Object reference not set to an instance of an object UnityEngine.TextCore.RichTextTagParser.CreateTextSpan (UnityEngine.TextCore.RichTextTagParser+Segment segment, UnityEngine.TextCore.NativeTextGenerationSettings& tgs, System.Collections.Generic.List`1[T] links, UnityEngine.Color hyperlinkColor, System.Single pixelsPerPoint) (at :0) UnityEngine.TextCore.RichTextTagParser.CreateTextGenerationSettingsArray (UnityEngine.TextCore.NativeTextGenerationSettings& tgs, System.Collections.Generic.List`1[T] links, UnityEngine.Color hyperlinkColor, System.Single pixelsPerPoint, UnityEngine.TextCore.Text.TextSettings textSettings) (at :0) UnityEngine.UIElements.UITKTextHandle.ConvertUssToNativeTextGenerationSettings (System.String textToMeasure, System.Nullable`1[T] fontsize) (at <0bcb90c459a2413a94634a44aeb1d754>:0) UnityEngine.UIElements.ATGTextJobSystem.PrepareShapingBeforeLayout (UnityEngine.UIElements.BaseVisualElementPanel panel) (at <0bcb90c459a2413a94634a44aeb1d754>:0) UnityEngine.UIElements.TextJobSystem.PrepareShapingBeforeLayout (UnityEngine.UIElements.BaseVisualElementPanel panel) (at <0bcb90c459a2413a94634a44aeb1d754>:0) UnityEngine.UIElements.VisualTreeLayoutUpdater.Update () (at <0bcb90c459a2413a94634a44aeb1d754>:0) UnityEngine.UIElements.VisualTreeUpdater.UpdateVisualTreePhase (UnityEngine.UIElements.VisualTreeUpdatePhase phase) (at <0bcb90c459a2413a94634a44aeb1d754>:0) UnityEngine.UIElements.Panel.UpdateForRepaint () (at <0bcb90c459a2413a94634a44aeb1d754>:0) UnityEditor.UIElements.EditorPanel.UpdateForRepaint () (at <9a6866749bf64829b050cb97017b2ca9>:0) UnityEngine.UIElements.Panel.Repaint (UnityEngine.Event e) (at <0bcb90c459a2413a94634a44aeb1d754>:0) UnityEngine.UIElements.UIElementsUtility.DoDispatch (UnityEngine.UIElements.BaseVisualElementPanel panel) (at <0bcb90c459a2413a94634a44aeb1d754>:0) UnityEngine.UIElements.UIElementsUtility.UnityEngine.UIElements.IUIElementsUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr, System.Boolean& eventHandled) (at <0bcb90c459a2413a94634a44aeb1d754>:0) UnityEngine.UIElements.UIEventRegistration.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr) (at <0bcb90c459a2413a94634a44aeb1d754>:0) UnityEngine.UIElements.UIEventRegistration+<>c.<.cctor>b__1_2 (System.Int32 i, System.IntPtr ptr) (at <0bcb90c459a2413a94634a44aeb1d754>:0) UnityEngine.GUIUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr, System.Boolean& result) (at :0)

[ksx-kshan]

Some additional info I gathered after some debugging with Claude:

Environment:

• Unity Version: 6000.3.0f1 (broken)
• Previously Working: Unity 6.2.x (confirmed working)
• Coplay Version: 8.3.2
• OS: Windows

---

Issue:
The Coplay window fails to render and throws continuous NullReferenceException errors on every repaint, making it
completely unusable.

---

Root Cause:
Unity 6.3 introduced a breaking change in TextCore's handling of legacy font definitions. The pattern used in
Coplay's USS stylesheets:

-unity-font: resource('Fonts/Font Awesome 6 Free-Solid-900');
-unity-font-definition: initial;

This pattern worked in Unity 6.2 but causes null reference crashes in Unity 6.3's
RichTextTagParser.CreateTextSpan.

---

Stack Trace:
NullReferenceException: Object reference not set to an instance of an object
UnityEngine.TextCore.RichTextTagParser.CreateTextSpan (...)
UnityEngine.TextCore.RichTextTagParser.CreateTextGenerationSettingsArray (...)
UnityEngine.UIElements.UITKTextHandle.ConvertUssToNativeTextGenerationSettings (...)
UnityEngine.UIElements.ATGTextJobSystem+PrepareShapingJob.Execute (...)

---

Affected Files (that I could identify):

• Editor/UI/Resources/style.uss - Font Awesome references in .toolbar, #submit, #feedback_buttons Button,
  #copy_message_button
• Editor/UI/Resources/coplay.uxml - Unicode escape sequences for Font Awesome icons (\uf0c5, \uf1da, etc.)
• Editor/UI/Resources/chat_message.uxml - Unicode escape sequences
• DLL code - Likely sets fonts dynamically via C# which cannot be patched externally

---

Partial Workaround Attempted:
Removing all -unity-font-definition: initial declarations and replacing Font Awesome unicode characters with plain
text reduced errors but didn't fully resolve the issue, indicating the DLL also sets fonts programmatically.

---

Suggested Fix:

1. Replace -unity-font-definition: initial with proper TextCore Font Assets
2. Or use Unity's default font system instead of legacy TrueType fonts
3. Convert Font Awesome .otf to a TextCore Font Asset

---

References:

• Unity 6.3 had TextCore fixes: "Fixed text render issues and various exceptions in textcore when using
  textsettings"
• Unity docs state Editor UI TextSettings cannot be customized by users
• This appears to be a Unity 6.3 regression that Coplay's font pattern triggers

[ksx-kshan]

I have submitted a bug report to unity as well.

[msanatan]

Thanks, we have a fix coming for this shortly @ksx-kshan

[ksx-kshan]

I am still seeing issues with 6000.3.2f1. I have removed the package and reinstalled. Will continue to do the standard debugging process for when packages dont seem to update for now.

[ksx-kshan]

I manually deleted the folder for the 2022+ version of the assembly and am still seeing the following errors regarding UIElements:

NullReferenceException: Object reference not set to an instance of an object
UnityEngine.TextCore.RichTextTagParser.CreateTextSpan (UnityEngine.TextCore.RichTextTagParser+Segment segment, UnityEngine.TextCore.NativeTextGenerationSettings& tgs, System.Collections.Generic.List1[T] links, UnityEngine.Color hyperlinkColor, System.Single pixelsPerPoint) (at <7dc8de8d12c1499bb812228fb46a0340>:0) UnityEngine.TextCore.RichTextTagParser.CreateTextGenerationSettingsArray (UnityEngine.TextCore.NativeTextGenerationSettings& tgs, System.Collections.Generic.List1[T] links, UnityEngine.Color hyperlinkColor, System.Single pixelsPerPoint, UnityEngine.TextCore.Text.TextSettings textSettings) (at <7dc8de8d12c1499bb812228fb46a0340>:0)
UnityEngine.UIElements.UITKTextHandle.ConvertUssToNativeTextGenerationSettings (System.String textToMeasure, System.Nullable`1[T] fontsize) (at <5c2380b11c444983ac3ffcbc73d04ba8>:0)
UnityEngine.UIElements.ATGTextJobSystem.PrepareTextElementForJobsOnMainThread (UnityEngine.UIElements.TextElement textElement) (at <5c2380b11c444983ac3ffcbc73d04ba8>:0)
UnityEngine.UIElements.ATGTextJobSystem.PrepareShapingBeforeLayout (UnityEngine.UIElements.BaseVisualElementPanel panel) (at <5c2380b11c444983ac3ffcbc73d04ba8>:0)
UnityEngine.UIElements.TextJobSystem.PrepareShapingBeforeLayout (UnityEngine.UIElements.BaseVisualElementPanel panel) (at <5c2380b11c444983ac3ffcbc73d04ba8>:0)
UnityEngine.UIElements.VisualTreeLayoutUpdater.Update () (at <5c2380b11c444983ac3ffcbc73d04ba8>:0)
UnityEngine.UIElements.VisualTreeUpdater.UpdateVisualTreePhase (UnityEngine.UIElements.VisualTreeUpdatePhase phase) (at <5c2380b11c444983ac3ffcbc73d04ba8>:0)
UnityEngine.UIElements.Panel.UpdateForRepaint () (at <5c2380b11c444983ac3ffcbc73d04ba8>:0)
UnityEditor.UIElements.EditorPanel.UpdateForRepaint () (at :0)
UnityEngine.UIElements.Panel.Repaint (UnityEngine.Event e) (at <5c2380b11c444983ac3ffcbc73d04ba8>:0)
UnityEngine.UIElements.UIElementsUtility.DoDispatch (UnityEngine.UIElements.BaseVisualElementPanel panel) (at <5c2380b11c444983ac3ffcbc73d04ba8>:0)
UnityEngine.UIElements.UIElementsUtility.UnityEngine.UIElements.IUIElementsUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr, System.Boolean& eventHandled) (at <5c2380b11c444983ac3ffcbc73d04ba8>:0)
UnityEngine.UIElements.UIEventRegistration.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr) (at <5c2380b11c444983ac3ffcbc73d04ba8>:0)
UnityEngine.UIElements.UIEventRegistration+<>c.<.cctor>b__1_2 (System.Int32 i, System.IntPtr ptr) (at <5c2380b11c444983ac3ffcbc73d04ba8>:0)
UnityEngine.GUIUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr, System.Boolean& result) (at <822ef144c83a49dfbe8ab1337f169b36>:0)