diff --git a/src/I18nProvider.tsx b/src/I18nProvider.tsx
index cec17c0..8230eb3 100644
--- a/src/I18nProvider.tsx
+++ b/src/I18nProvider.tsx
@@ -24,7 +24,7 @@ export default function I18nProvider({
   const lang = lng || parentLang || locale || defaultLocale || ''
   const config = { ...internal.config, ...newConfig }
   const localesToIgnore = config.localesToIgnore || ['default']
-  const ignoreLang = localesToIgnore.includes(lang)
+  const ignoreLang = !lang || localesToIgnore.includes(lang)
   const pluralRules = new Intl.PluralRules(ignoreLang ? undefined : lang)
   const t = transCore({ config, allNamespaces, pluralRules, lang })