diff --git a/packages/taler-wallet-webextension/src/components/TransactionItem.tsx b/packages/taler-wallet-webextension/src/components/TransactionItem.tsx
index ea260d141..8033b3ee3 100644
--- a/packages/taler-wallet-webextension/src/components/TransactionItem.tsx
+++ b/packages/taler-wallet-webextension/src/components/TransactionItem.tsx
@@ -113,6 +113,8 @@ export function TransactionItem(props: { tx: Transaction }): VNode {
           pending={tx.pending}
         />
       );
+    default:
+      throw Error("unsupported transaction type");
   }
 }