balance.transfert() does not always return a relevant value

If I send a payment from wallet with balance > 0 && balance < paymentAmount, extrinsics balance.transfert() return:

Exception: balances.InsufficientBalance

but if I send a payment from wallet with balance == null (non existing wallet), extrinsics balance.transfert() return:

{hash: 0x08918a5442bceac91b9a21b4de270448edac12a149f4a0c5f8afb72c4a9704ee, blockHash: 0x1d6adf1c625b82a9fda0bdd6324fbb1ddff066b931e14066bd5ec76fbf506735}

This is the same answer as validated transaction ! Is it a normal behavior ?

Is it possible to return same Exception as first, or Exception: balances.NullBalance ?

I precise the result is OK when balance == 0 (non null)