Solving 'stdin: is not a tty ' error

The 「stdin: is not a tty」 warning kept on popping up when ssh-ing to a few servers. I’ve learned that the problem is because I had mesg n on top of my .bash_rc file. Quick fix is to wrap it around an if statement, like so:

if `tty -s`; then
   mesg n
fi

Or replace mesg n with:

tty -s && mesg n