#428

frontend/src/lib/prefetchers.ts

@@ -50,6 +50,8 @@ const prefetchHelpShow: Prefetcher = async (qc, url, locale) => {
       queryFn: () => getHelpArticle (identifier),
       staleTime: Infinity })
   const language = resolveHelpLanguage (article, localeLanguage (locale))
+  if (language == null)
+    return
   const edition = url.searchParams.get ('edition') ?? article?.languages[language]?.currentEdition
   if (edition == null)
     return
@@ -84,6 +86,8 @@ const prefetchHelpDiff: Prefetcher = async (qc, url, locale) => {
       queryFn: () => getHelpArticle (identifier),
       staleTime: Infinity })
   const language = resolveHelpLanguage (article, localeLanguage (locale))
+  if (language == null)
+    return
   await qc.prefetchQuery ({
       queryKey: helpKeys.diff (identifier, language, from, to),
       queryFn: () => getHelpDiff (identifier, language, from, to),