Slack crashes on attach file

Dear Snapcraft,

Using the slack snap v.4.8.0 on openSuse Tumbleweed with KDE, every time I click attach file, then select Your Computer, slack crashes with the following error

qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 54207, resource id: 115343361, major code: 18 (ChangeProperty), minor code: 0

This does not happen when I install slack 4.8.0 using the rpm provided on the slack website.

Thanks for helping!


Installed version:

snap-id:      JUJH91Ved74jd4ZgJCpzMBtYbPOzTlsD
tracking:     latest/stable
refresh-date: today at 08:49 CEST
  latest/stable:    4.8.0 2020-07-31 (27) 124MB classic
  latest/candidate: ^                           
  latest/beta:      ^                           
  latest/edge:      3.3.1 2018-08-31  (8) 148MB classic
installed:          4.8.0            (27) 124MB classic

# snap --version
snap                 2.44.5-1.16
snapd                2.44.5-1.16
series               16
opensuse-tumbleweed  20200603
kernel               5.6.14-1-default


I am using Ubuntu 20.04

1 Like


I had this problem. Then slack as a snap application, and I downloaded a the corresponding .deb package from the slack website. I opened it with “Software Install”, and now attaching files works as it should.