write error: broken pipe with lemonbar script

I'm trying to pipe a bar script into lemonbar in bspwm. In my bspwmrc I have: ~/.config/bspwm/lemonbar.sh | lemonbar -p lemonbar.sh contains: #!/bin/bash clock() { date +%H:%M:%S } while true; do echo "%{c}$(clock)" sleep 1; done Everything works as expected, except when I exit bspwm I get: line 12: echo: write error: Broken pipe Obviously the error has something to do with the echo on line 12 but I can't figure out exactly what