ss crashes when using --no-header

Steps to reproduce:

1) Listen on port 8989:
$ nc -l 8989 &

2) Check that ss can list this listener:
$ ss --no-header -nto state listening 'sport = 8989'
0 1 0.0.0.0:8989 0.0.0.0:*

3) Ask ss to list listeners on a port where nothing listens
$ kill %1 # stops nc
$ ss --no-header -nto state listening 'sport = 8989'
Segmentation fault (core dumped)

In the above, removing "--no-header" avoids the segfault.

Additional information:

$ lsb_release -rd
Description: Ubuntu 18.04.1 LTS
Release: 18.04
$ apt-cache policy iproute2
iproute2:
  Installed: 4.15.0-2ubuntu1
  Candidate: 4.15.0-2ubuntu1
  Version table:
 *** 4.15.0-2ubuntu1 500
        500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages
        100 /var/lib/dpkg/status

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: iproute2 4.15.0-2ubuntu1
ProcVersionSignature: Ubuntu 4.15.0-32.35-generic 4.15.18
Uname: Linux 4.15.0-32-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Thu Aug 16 08:17:52 2018
InstallationDate: Installed on 2018-07-15 (32 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180714)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_CA.UTF-8
 SHELL=/bin/bash
SourcePackage: iproute2
UpgradeStatus: No upgrade log present (probably fresh install)