diff --git a/packages/theme/src/index.ts b/packages/theme/src/index.ts
index da5c196b00..020cc9f2dd 100644
--- a/packages/theme/src/index.ts
+++ b/packages/theme/src/index.ts
@@ -79,4 +79,4 @@ export function initThemeStore (): void {
   )
 }
 
-export const languageStore = derived(themeStore, ($theme) => $theme.language)
+export const languageStore = derived(themeStore, ($theme) => $theme?.language ?? '')