provider.sendTransaction throws Error: [object Object]

[nocktoshi]

To recreate:

Try to spend a transaction with insufficient funds:

        try {
          const tx = provider
            .transaction()
            .to(PAYMENT_ADDRESS)
            .amount(fee * 65536)
            .build();

          const txId = await provider.sendTransaction(tx);
          setTransactionHash(txId);
          setTransactionStatus("pending");
          setStatusText(
            `Transaction sent! Waiting for confirmation...\nTransaction Hash: ${txId}`
          );
        } catch (error) {
          setTransactionStatus("failed");
          setStatusText("Failed to send transaction: " + error.message);
        }

The error coming back from provider is a string "Error: [object Object]" when it should be an object with message property.