Trackballs segfaults on game start (amdgpu-pro 19.50) (bionic)

[Dima]

The fault happens when I press "New game".

$ trackballs
Welcome to Trackballs.
Using /usr/share/games/trackballs as gamedata directory.
Xlib: extension "AMDGPU" missing on display ":0.0".
Xlib: extension "GLX_ARB_context_flush_control" missing on display ":0.0".
[WARNING] Warning. Could not find file /home/user/.trackballs/highScores
[WARNING] Warning. Could not find file /home/user/.trackballs/user.gmr
[WARNING] Warning. Could not find file /home/user/.trackballs/user.gmr
Segmentation fault (core dumped)

$ uname -a
Linux user 4.15.0-76-generic #86-Ubuntu SMP Fri Jan 17 17:24:28 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: trackballs 1.2.4-1
ProcVersionSignature: Ubuntu 4.15.0-76.86-generic 4.15.18
Uname: Linux 4.15.0-76-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.9
Architecture: amd64
CurrentDesktop: LXDE
Date: Fri Feb 7 21:21:51 2020
EcryptfsInUse: Yes
InstallationDate: Installed on 2018-06-11 (606 days ago)
InstallationMedia: Lubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
SourcePackage: trackballs
UpgradeStatus: No upgrade log present (probably fresh install)