X Window System Error Crash

[Nicholas Tsimerekis]

Description: Ubuntu 20.04 LTS
Release: 20.04

I am running a fresh install of Ubuntu MATE 20.04. Have not yet tested on 18.04 or bullseye.
Last time I used glade on buster it worked just fine.

libc6:
  Installed: 2.31-0ubuntu9
  Candidate: 2.31-0ubuntu9
  Version table:
 *** 2.31-0ubuntu9 500
        500 http://us.archive.ubuntu.com/ubuntu focal/main amd64 Packages
        100 /var/lib/dpkg/status
libcairo2:
  Installed: 1.16.0-4ubuntu1
  Candidate: 1.16.0-4ubuntu1
  Version table:
 *** 1.16.0-4ubuntu1 500
        500 http://us.archive.ubuntu.com/ubuntu focal/main amd64 Packages
        100 /var/lib/dpkg/status
libgdk-pixbuf2.0-0:
  Installed: 2.40.0+dfsg-3
  Candidate: 2.40.0+dfsg-3
  Version table:
 *** 2.40.0+dfsg-3 500
        500 http://us.archive.ubuntu.com/ubuntu focal/main amd64 Packages
        100 /var/lib/dpkg/status
libgladeui-2-6:
  Installed: 3.22.2-1
  Candidate: 3.22.2-1
  Version table:
 *** 3.22.2-1 500
        500 http://us.archive.ubuntu.com/ubuntu focal/universe amd64 Packages
        100 /var/lib/dpkg/status
libglib2.0-0:
  Installed: 2.64.2-1~fakesync1
  Candidate: 2.64.2-1~fakesync1
  Version table:
 *** 2.64.2-1~fakesync1 500
        500 http://us.archive.ubuntu.com/ubuntu focal/main amd64 Packages
        100 /var/lib/dpkg/status
libgtk-3-0:
  Installed: 3.24.18-1ubuntu1
  Candidate: 3.24.18-1ubuntu1
  Version table:
 *** 3.24.18-1ubuntu1 500
        500 http://us.archive.ubuntu.com/ubuntu focal/main amd64 Packages
        100 /var/lib/dpkg/status
libpango-1.0-0:
  Installed: 1.44.7-2ubuntu4
  Candidate: 1.44.7-2ubuntu4
  Version table:
 *** 1.44.7-2ubuntu4 500
        500 http://us.archive.ubuntu.com/ubuntu focal/main amd64 Packages
        100 /var/lib/dpkg/status
devhelp:
  Installed: 3.36.1-1
  Candidate: 3.36.1-1
  Version table:
 *** 3.36.1-1 500
        500 http://us.archive.ubuntu.com/ubuntu focal/universe amd64 Packages
        100 /var/lib/dpkg/status
libgtk-3-dev:
  Installed: 3.24.18-1ubuntu1
  Candidate: 3.24.18-1ubuntu1
  Version table:
 *** 3.24.18-1ubuntu1 500
        500 http://us.archive.ubuntu.com/ubuntu focal/main amd64 Packages
        100 /var/lib/dpkg/status

When clicking on anything in the toplevels tab, the application immediately closes. When done in terminal, it outputs this error message.

(glade:29210): Gdk-ERROR **: 13:55:48.782: The program 'glade' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadWindow (invalid Window parameter)'.
  (Details: serial 30493 error_code 3 request_code 20 (core protocol) minor_code 0)
  (Note to programmers: normally, X errors are reported asynchronously;
   that is, you will receive the error a while after causing it.
   To debug your program, run it with the GDK_SYNCHRONIZE environment
   variable to change this behavior. You can then get a meaningful
   backtrace from your debugger if you break on the gdk_x_error() function.)
Trace/breakpoint trap (core dumped)

Thank you maintainers, I hope this is not too hard to fix.