BUG Set a breakpoint on '_pixman_log_error' to debug

Launched Gthumb at CL
gthumb performed nominally
on close I so error in the terminal
gthumb
*** BUG ***
In pixman_region32_init_rect: Invalid rectangle passed
Set a breakpoint on '_pixman_log_error' to debug

*** BUG ***
In pixman_region32_init_rect: Invalid rectangle passed
Set a breakpoint on '_pixman_log_error' to debug

*** BUG ***
In pixman_region32_init_rect: Invalid rectangle passed
Set a breakpoint on '_pixman_log_error' to debug

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: gthumb 3:3.8.0-2.1build1
ProcVersionSignature: Ubuntu 5.4.0-48.52-generic 5.4.60
Uname: Linux 5.4.0-48-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.9
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Tue Oct 6 10:40:18 2020
InstallationDate: Installed on 2015-08-23 (1870 days ago)
InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
SourcePackage: gthumb
UpgradeStatus: Upgraded to focal on 2020-06-06 (121 days ago)