From 63f1c54f12529e081ae33a4ce3a5ba35ba618c2e Mon Sep 17 00:00:00 2001
From: Guille Gonzalez <gonzalezreal@icloud.com>
Date: Sat, 10 Jan 2026 06:14:44 +0100
Subject: [PATCH] Handle empty font variant tables in FontMetrics

---
 Sources/SwiftUIMath/Internal/Font/FontMetrics.swift | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/Sources/SwiftUIMath/Internal/Font/FontMetrics.swift b/Sources/SwiftUIMath/Internal/Font/FontMetrics.swift
index cfd6d78..04ff39f 100644
--- a/Sources/SwiftUIMath/Internal/Font/FontMetrics.swift
+++ b/Sources/SwiftUIMath/Internal/Font/FontMetrics.swift
@@ -30,7 +30,8 @@ extension Math {
       guard
         let graphicsFont = FontRegistry.shared.graphicsFont(named: font.name),
         let glyphName = graphicsFont.name(for: glyph) as String?,
-        let variantGlyphs = table.vVariants[glyphName]
+        let variantGlyphs = table.vVariants[glyphName],
+        !variantGlyphs.isEmpty
       else {
         return [glyph]
       }
@@ -44,7 +45,8 @@ extension Math {
       guard
         let graphicsFont = FontRegistry.shared.graphicsFont(named: font.name),
         let glyphName = graphicsFont.name(for: glyph) as String?,
-        let variantGlyphs = table.hVariants[glyphName]
+        let variantGlyphs = table.hVariants[glyphName],
+        !variantGlyphs.isEmpty
       else {
         return [glyph]
       }
@@ -58,7 +60,8 @@ extension Math {
       guard
         let graphicsFont = FontRegistry.shared.graphicsFont(named: font.name),
         let glyphName = graphicsFont.name(for: glyph) as String?,
-        let variantGlyphs = table.vVariants[glyphName]
+        let variantGlyphs = table.vVariants[glyphName],
+        !variantGlyphs.isEmpty
       else {
         return glyph
       }