ubuntu-bug -w then click on xeyes fails to report a bug

[Lyn Perrine]

To reproduce run xeyes then run ubuntu-bug -w and close the popup telling you to click on a window. Then click on xeyes. I get an error message from apport saying xprop failed to determine the process id of the window.
apport:
  Installed: 2.20.1-0ubuntu2.1
  Candidate: 2.20.1-0ubuntu2.1
  Version table:
 *** 2.20.1-0ubuntu2.1 500
        500 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
        500 http://us.archive.ubuntu.com/ubuntu xenial-updates/main i386 Packages
        100 /var/lib/dpkg/status
     2.20.1-0ubuntu2 500
        500 http://us.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
        500 http://us.archive.ubuntu.com/ubuntu xenial/main i386 Packages
Description: Ubuntu 16.04 LTS
Release: 16.04

xprop seemingly gives a lot of output from xprop but this fails when trying to report a bug on it from apport. Instead I get xprop failed to get the process id from the window and this output seems to succeed when I just run xprop on xeyes and get this output from xprop.
the output from xprop on xeyes is.
WM_STATE(WM_STATE):
  window state: Normal
  icon window: 0x0
WM_PROTOCOLS(ATOM): protocols WM_DELETE_WINDOW
WM_CLIENT_LEADER(WINDOW): window id # 0x1c0000a
WM_LOCALE_NAME(STRING) = "en_US.UTF-8"
WM_CLASS(STRING) = "xeyes", "XEyes"
WM_HINTS(WM_HINTS):
  Client accepts input or input focus: False
  Initial state is Normal State.
  bitmap id # to use for icon: 0x1c00001
  bitmap id # of mask for icon: 0x1c00003
WM_NORMAL_HINTS(WM_SIZE_HINTS):
  program specified size: 150 by 100
  window gravity: NorthWest
WM_CLIENT_MACHINE(STRING) = "brendanperrine-coolermastern200"
WM_COMMAND(STRING) = { "xeyes" }
WM_ICON_NAME(STRING) = "xeyes"
WM_NAME(STRING) = "xeyes"

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: apport 2.20.1-0ubuntu2.1
ProcVersionSignature: Ubuntu 4.4.0-28.47-generic 4.4.13
Uname: Linux 4.4.0-28-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CrashReports:
 640:1000:115:2970467:2016-07-04 11:51:43.990810416 -0700:2016-07-04 13:30:51.419527275 -0700:/var/crash/_usr_bin_audacious.1000.crash
 640:1000:115:1606594:2016-07-04 19:22:02.393270616 -0700:2016-07-04 19:22:00.921303054 -0700:/var/crash/_usr_bin_lxterminal.1000.crash
CurrentDesktop: i3
Date: Thu Jul 7 16:58:40 2016
InstallationDate: Installed on 2015-09-20 (291 days ago)
InstallationMedia: Lubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150920)
PackageArchitecture: all
SourcePackage: apport
UpgradeStatus: Upgraded to xenial on 2016-03-12 (117 days ago)

[Brian Murray (brian-murray)]

This might be unique to xeyes as I was able to determine the process id of gedit and terminator using xprop. This seems more like a bug in xprop than apport.