Getting error while creating user during FirstBoot.

Issue

• While creating an user with numeric value, following error appears in firstboot.

File "/usr/share/firstboot/modules/firstbootWindow.py" line 266, in nextClicked
  result=module.apply(self.notebook)
File "/usr/share/firstboot/modules/create_user.py" on line 244 in apply self.admin.user(userEnt)
RuntimeError:user xxx has no name

• The username was numeric.