From 70066e80433cf79169d4fff9278e8d4cd0b350e8 Mon Sep 17 00:00:00 2001
From: wesleyel <48174882+wesleyel@users.noreply.github.com>
Date: Tue, 7 Apr 2026 20:35:20 +0800
Subject: [PATCH] Handle invalid inter-element spaces to prevent crashes in
 debug builds

---
 Sources/SwiftUIMath/Internal/Display/Typesetter.swift | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Sources/SwiftUIMath/Internal/Display/Typesetter.swift b/Sources/SwiftUIMath/Internal/Display/Typesetter.swift
index d87eec6..b13f502 100644
--- a/Sources/SwiftUIMath/Internal/Display/Typesetter.swift
+++ b/Sources/SwiftUIMath/Internal/Display/Typesetter.swift
@@ -1846,7 +1846,11 @@ extension Math {
       let spaceArray = getInterElementSpaces()[Int(leftIndex)]
       let spaceTypeObj = spaceArray[Int(rightIndex)]
       let spaceType = spaceTypeObj
-      assert(spaceType != .invalid, "Invalid space between \(left) and \(right)")
+      // Keep malformed LaTeX from crashing debug builds. Propagating NaN lets callers
+      // detect the failed layout and surface it as a validation issue instead.
+      if spaceType == .invalid {
+        return .nan
+      }
 
       let spaceMultipler = self.getSpacingInMu(spaceType)
       if spaceMultipler > 0 {