caddy: Browse: Internal Server Error

1. What version of Caddy are you running (caddy -version)?

Caddy 0.8.2 | Caddy build from master

2. What are you trying to do?

Running Caddy with browse enabled

3. What is your entire Caddyfile?

domain.com {
        root /var/www/html/

        tls me@domain.com {
                protocols tls1.2 tls1.2
                ciphers ECDHE-ECDSA-AES256-GCM-SHA384 ECDHE-RSA-AES256-GCM-SHA384 ECDHE-ECDSA-AES128-GCM-SHA256 ECDHE-RSA-AES128-GCM-SHA256
        }

        header / {
                Content
        }

        log /var/log/caddy/access.log {
                rotate {
                        size 100
                        age  14
                        keep 10
                }
        }

        errors {
                log /var/log/caddy/error.log {
                        size 50
                        age  30
                        keep 5
                }
        }

        browse /

        fastcgi / unix:/var/run/php/php7.0-fpm.sock php
}

4. How did you run Caddy (give the full command and describe the execution environment)?

Ubuntu Wily (systemd service)

/usr/sbin/caddy -agree=true -conf=/etc/caddy/Caddyfile -pidfile=/var/run/caddy/caddy.pid -log=stderr

5. What did you expect to see?

no errors with master

6. What did you see instead (give full error messages and/or log)?

500 Internal Server Error

17/Apr/2016:17:21:40 +0000 [ERROR 500 /linux-dash/] Directory contains index file, not browsable!