Problem when using MoneyMaskedTextController on TextFormField

[fernandosutter]

When i use this basic money controller in a TextFormField:

MoneyMaskedTextController moneyController = MoneyMaskedTextController(leftSymbol: 'R\$');

TextFormField(controller: moneyController)

I get this error when the field is empty:

Exception has occurred.
RangeError (RangeError: Value not in range: -1)

After this, the there is some value on the field, there is another error:

Exception has occurred.
FormatException (FormatException: Invalid radix-10 number (at character 1)
R$5.555,554
^
)

In debug console, nothing appers