diff --git a/apps/web/tests/styles/theme.test.ts b/apps/web/tests/styles/theme.test.ts
index c8f29f4..6491fea 100644
--- a/apps/web/tests/styles/theme.test.ts
+++ b/apps/web/tests/styles/theme.test.ts
@@ -106,7 +106,7 @@ describe('the offline page', () => {
   function tokensIn(text: string) {
     return new Map(
       Array.from(text.matchAll(/^\s*(--[a-z-]+):([^;]+);/gm), (match) => [
-        match[1],
+        match[1] ?? '',
         match[2]?.replace(/\s+/g, ' ').trim(),
       ]),
     )