Site is running fine in production. (Phew)

git pull to my laptop to make changes.

Visit site in Laravel Valet and see this error: FatalThrowableError in Updater.php line 232: Call to a member function in() on null

I can't do anything via the command line as it throws the same error.

Cleared local/storage/framework/cache without any joy

Any ideas would be appreciated please.

Thanks in advance