diff --git a/src/routes/ListeResistants.tsx b/src/routes/ListeResistants.tsx
index ff7b283..18411bc 100644
--- a/src/routes/ListeResistants.tsx
+++ b/src/routes/ListeResistants.tsx
@@ -37,7 +37,7 @@ function FiltreDepartement(props: { onChange: (event: React.ChangeEvent<HTMLSele
     </select>;
 }
 
-const normalize = (text: string) => text
+const normalize = (text: string) => (text || "")
     .toLowerCase()
     .normalize("NFD")
     .replace(/\p{Diacritic}/gu, "")