1 files changed, 3 insertions, 3 deletions
diff --git a/packages/taler-wallet-core/src/pay-peer-common.ts b/packages/taler-wallet-core/src/pay-peer-common.ts
index bfd39b657..a1729ced7 100644
--- a/packages/taler-wallet-core/src/pay-peer-common.ts
+++ b/packages/taler-wallet-core/src/pay-peer-common.ts
@@ -140,10 +140,10 @@ export async function getMergeReserveInfo(
     { storeNames: ["exchanges", "reserves"] },
     async (tx) => {
       const ex = await tx.exchanges.get(req.exchangeBaseUrl);
-      checkDbInvariant(!!ex);
+      checkDbInvariant(!!ex, `no exchange record for ${req.exchangeBaseUrl}`);
       if (ex.currentMergeReserveRowId != null) {
         const reserve = await tx.reserves.get(ex.currentMergeReserveRowId);
-        checkDbInvariant(!!reserve);
+        checkDbInvariant(!!reserve, `reserver ${ex.currentMergeReserveRowId} missing in db`);
         return reserve;
       }
       const reserve: ReserveRecord = {
@@ -151,7 +151,7 @@ export async function getMergeReserveInfo(
         reservePub: newReservePair.pub,
       };
       const insertResp = await tx.reserves.put(reserve);
-      checkDbInvariant(typeof insertResp.key === "number");
+      checkDbInvariant(typeof insertResp.key === "number", `reserve key is not a number`);
       reserve.rowId = insertResp.key;
       ex.currentMergeReserveRowId = reserve.rowId;
       await tx.exchanges.put(ex);