Public bug reported:

1,2) Please see the apport attachment.
3) Steps to reproduce:
1. Open pcmanfm-qt.
2. Go to root dir /
3. Change the view of the dir to "Detailed list"
4. Open /etc dir with double click. If it opened in Icon View mode then step 
back and try to enter to /etc

4) pcmanfm-qt segfaults in my case. My current related dmesg output:
"
[   99.878774] pcmanfm-qt[1051]: segfault at 560d40011390 ip 0000560d40011390 
sp 00007ffe107ca5d8 error 15                
[  190.640536] pcmanfm-qt[1237]: segfault at 556c0b82dba0 ip 0000556c0b82dba0 
sp 00007fffefd12e08 error 15                
[ 1214.139394] pcmanfm-qt[1320]: segfault at 7f242900dda0 ip 00007f2428e39cde 
sp 00007ffc37114630 error 4 in libc-2.27.so[7f2428da2000+1e7000]
[ 1668.239954] pcmanfm-qt[3154]: segfault at 7fcb0f14f2b0 ip 00007fcb0f14f2b0 
sp 00007ffe60521188 error 15 in libc-2.27.so[7fcb0f14e000+2000]
"

The last two is after installing of apport. But it maybe unrelated.
I've tried it on Lubuntu Next daily-build of 19.05.2018. And the problem is 
existing on it.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: pcmanfm-qt 0.12.0-5
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic x86_64
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
CasperVersion: 1.394
CurrentDesktop: LXQt
Date: Sat May 19 21:58:55 2018
LiveMediaBuild: Lubuntu-Next 18.04 LTS "Bionic Beaver" - Release amd64 
(20180503)
SourcePackage: pcmanfm-qt
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: pcmanfm-qt (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic lubuntu-next

** Attachment added: "$strace -o pcmanfm-qt.txt pcmanfm-qt"
   
https://bugs.launchpad.net/bugs/1772214/+attachment/5141789/+files/pcmanfm-qt.txt

** Tags added: lubuntu-next

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https://bugs.launchpad.net/bugs/1772214

Title:
  pcmanfm-qt segfaults after some tricks (Lubuntu Next 18.04 and
  dailybuild of 19.05.2018)

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