after opening a directory with a lot of files and pressing fn plus down arow segmentation fault happens

steps to reproduce.
open a folder with many files
press fn and the down arrow key a few times quickly.
what should happen
pcmanfm should take me to a file much ferver down the list
what happens
pcmanfm crashes with a segfault

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: pcmanfm 1.2.0-1
ProcVersionSignature: Ubuntu 3.16.0-38.52~14.04.1-generic 3.16.7-ckt10
Uname: Linux 3.16.0-38-generic i686
ApportVersion: 2.14.1-0ubuntu3.11
Architecture: i386
Config_pcmanfm_System_mate: Error: [Errno 2] No such file or directory: '/etc/xdg/pcmanfm/mate/pcmanfm.conf'
CurrentDesktop: MATE
Date: Fri May 29 15:03:15 2015
InstallationDate: Installed on 2015-05-27 (1 days ago)
InstallationMedia: Vinux 14.04.2 LTS "Trusty Tahr" - Release i386 (20150527)
SourcePackage: pcmanfm
UpgradeStatus: No upgrade log present (probably fresh install)