App Finder, when summoned, launches twice

[c3d]

Description: Ubuntu 16.04.3 LTS
Release: 16.04

xfce4-appfinder:
  Installé : 4.12.0-2ubuntu1
  Candidat : 4.12.0-2ubuntu1
 Table de version :
 *** 4.12.0-2ubuntu1 500
        500 http://tw.archive.ubuntu.com/ubuntu xenial/universe i386 Packages
        100 /var/lib/dpkg/status

When I summon the app finder, I expect it to appear once but it always appears twice

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: xfce4-appfinder 4.12.0-2ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-109.132-generic 4.4.98
Uname: Linux 4.4.0-109-generic i686
ApportVersion: 2.20.1-0ubuntu2.15
Architecture: i386
CurrentDesktop: XFCE
Date: Fri Jan 26 07:25:32 2018
ExecutablePath: /usr/bin/xfce4-appfinder
InstallationDate: Installed on 2017-05-23 (247 days ago)
InstallationMedia: Xubuntu 16.04 LTS "Xenial Xerus" - Release i386 (20160420.1)
SourcePackage: xfce4-appfinder
UpgradeStatus: No upgrade log present (probably fresh install)

[Theo Linkspfeifer (lastonestanding)]

Please run the following command in a terminal:

XFSETTINGSD_DEBUG=1 xfsettingsd --replace --no-daemon

Does the output tell you that Alt+F2/F3 is being activated twice? If no, which of the following commands trigger the issue?

xfrun4
xfrun4 --disable-server
xfce4-appfinder
xfce4-appfinder --disable-server

If these generate any terminal output, please attach it to this report.

[Launchpad Janitor (janitor)]

[Expired for xfce4-appfinder (Ubuntu) because there has been no activity for 60 days.]