Message undefined with non-existing username through the LoginForm widget

When a user enters an non-existing username in the login screen that makes use of the Login Form widget, the message it shows: "undefined". Where/ How can I change this message into something like "username does not exist?"
1 answers

You may want to try using version 3.0 of the widget, as others have seen issues with the red message caption in versions 3.1 and 3.1.1

With version 3.0, the message I receive is "The username or password you entered is incorrect."