The method 'substring' was called on null. E/flutter ( 2654): Receiver: null E/flutter ( 2654): Tried calling: substring(0, 1)

[abinvs-2019]

Having the issue....

[Sanchaksh]

child: Text("${userName.substring(0, 1).toUpperCase()}", style: mediumTextStyle(),),

Are you having an issue in this line of code?

[Sanchaksh]

If yes that is because your chatRoom function is not getting any values and we can not pass null in flutter Widgets. Please share your code for further correction.