mu is crashing with ***stack smashing detected*** error

I'm running an 'mu' find command and it looks like it's overrunning the end of an array and triggering some more aggressive memory checking enabled with the newer version of gcc in xenial.

Here's the actual command I'm running and the crash output:

$ mu find "hello" --threads --include-related -n 500
*** stack smashing detected ***: mu terminated
Wed May 3 21:13:44 2000

Aborted (core dumped)

$ lsb_release -rd
Description: Ubuntu 16.04.4 LTS
Release: 16.04

$ apt-cache policy maildir-utils
maildir-utils:
  Installed: 0.9.12-3
  Candidate: 0.9.12-3
  Version table:
 *** 0.9.12-3 500
        500 http://mirrors.rit.edu/ubuntu-archive xenial/universe amd64 Packages
        100 /var/lib/dpkg/status

Please let me know if there's any other information I can gather for you or supply.

Thanks,
David