tolerate zero-value payments

1 files changed, 2 insertions, 1 deletions

diff --git a/packages/taler-wallet-core/src/operations/pay.ts b/packages/taler-wallet-core/src/operations/pay.ts
index 33d3bc83c..fed61428c 100644
--- a/packages/taler-wallet-core/src/operations/pay.ts
+++ b/packages/taler-wallet-core/src/operations/pay.ts
@@ -145,7 +145,8 @@ export async function getTotalPaymentCost(
         costs.push(pcs.coinContributions[i]);
         costs.push(refreshCost);
       }
-      return Amounts.sum(costs).amount;
+      const zero = Amounts.getZero(pcs.paymentAmount.currency);
+      return Amounts.sum([zero, ...costs]).amount;
     });
 }