diff --git a/misc/format.ts b/misc/format.ts
index ca3a8cc..852d1fa 100644
--- a/misc/format.ts
+++ b/misc/format.ts
@@ -5,6 +5,8 @@ export function useNumberFormat() {
   const { i18n } = useTranslation();
 
   return (number: number, digits = 2, currency = null) => {
+    if(number == undefined)
+      return null;
     if (currency) {
       if ((Math.round(number * (10 ** digits)) / (10 ** digits)) === 0)
         return "---";