[Xymon] Xymon and Lighttpd 500 Internal Error

[Guy]

Hello,

The Xymon index page is loading; however, when I attempt to drill down
into an individual service check (invoking svcstatus.sh), lighttpd
returns a 500 internal server error.

OS: Devuan Ascii 2.0
Kernel: Linux pihole 4.9.0-9-amd64 #1 SMP Debian 4.9.168-1+deb9u5
(2019-08-11) x86_64 GNU/Linux
Lighttpd: Version: 1.4.45-1
Xymon: Version: 4.3.28-2

Xymon and lighttpd were both installed from the official Devuan repos
using apt-get.

Here's my lighttpd config: https://clbin.com/F2LzF
Here's an strace: https://clbin.com/EuesM

Thanks,

Guy