I can confirm I was able to reproduce this error while using a comma
[it only appears after clicking the generate QR code button], instead of a period.
but in addition to giving this error, there is no way to insert the dot depending on the compatibility of the application to make the request, the keyboard only offers the comma option.
A good workaround is to copy a dot
[or a period] from an article and paste it into the amount field.
- Voice inputs [Google Voice is better for punctuation marks] might also work [depending on your settings, you might have to enable it first].