support undefined taxes

1 files changed, 2 insertions, 1 deletions

diff --git a/packages/merchant-backoffice-ui/src/paths/instance/products/list/Table.tsx b/packages/merchant-backoffice-ui/src/paths/instance/products/list/Table.tsx
index 9d5701fa7..39e2fd0c7 100644
--- a/packages/merchant-backoffice-ui/src/paths/instance/products/list/Table.tsx
+++ b/packages/merchant-backoffice-ui/src/paths/instance/products/list/Table.tsx
@@ -506,6 +506,7 @@ function difference(price: string, tax: number) {
   ps[1] = `${p - tax}`;
   return ps.join(":");
 }
-function sum(taxes: TalerMerchantApi.Tax[]) {
+function sum(taxes: TalerMerchantApi.Tax[] | undefined) {
+  if (taxes === undefined) return 0;
   return taxes.reduce((p, c) => p + parseInt(c.tax.split(":")[1], 10), 0);
 }