1 files changed, 3 insertions, 0 deletions
diff --git a/extension/background/wallet.ts b/extension/background/wallet.ts
index 7fee5490e..ee406d2ed 100644
--- a/extension/background/wallet.ts
+++ b/extension/background/wallet.ts
@@ -157,6 +157,9 @@ function getPossibleMintCoins(db: IDBDatabase,
                         .get(info.master_pub);
       req_mints.onsuccess = (e) => {
         let mint: Db.Mint = req_mints.result;
+        if (!mint) {
+          throw Error("no matching mint in index");
+        }
         let req_coins = tx.objectStore("coins")
                           .index("mintBaseUrl")
                           .openCursor(IDBKeyRange.only(mint.baseUrl));