flutter _CastError (type 'Null' is not a subtype of type 'String' in type cast)-CodePudding

when i click on a single product link it throws this error:

_CastError (type 'Null' is not a subtype of type 'String' in type cast)

and vscode sends cursor to this line:

'''final productId = ModalRoute.of(context)?.settings.arguments as String;'''

i changed ? to ! sign and that gives same error

CodePudding user response：

Your line should be:

final productId = ModalRenter code hereoute.of(context)?.settings?.arguments as String?;

CodePudding user response：

your productId returns null, please first try make to make sure that productId is not null.Don't force ! without checking for null.