diff --git a/src/modules/source/components/SourceLanguageSelect.tsx b/src/modules/source/components/SourceLanguageSelect.tsx
index 716a464e..9e10836c 100644
--- a/src/modules/source/components/SourceLanguageSelect.tsx
+++ b/src/modules/source/components/SourceLanguageSelect.tsx
@@ -120,7 +120,7 @@ export const SourceLanguageSelect = ({
                         increaseViewportBy={400}
                         computeItemKey={(index) => languagesSortedBySelectState[index]}
                         itemContent={(_index, language) => {
-                            const sourcesOfLanguage = sourcesByLanguage[language];
+                            const sourcesOfLanguage = sourcesByLanguage[language] ?? [];
                             const isEnabled = tmpSelectedLanguages.includes(language);
 
                             return (