help diagnosing crashes that happen when guake window is open

**Describe the bug**

Hello. I am a longtime, avid user of guake, and I am having trouble with persistent system crashes which invariably occur when the guake window is open (toggled on). I am posting this issue as a request for help to diagnose what the underlying problem is.

About once a week, my computer crashes, becoming completely unresponsive. The monitors are frozen in place, mouse and keyboard input does nothing, and the machine will no longer respond to a ping over the network.

The one persistent aspect of these crashes is that I am always working in my guake dropdown terminal at the time.

When I hard reboot the machine, the logs end abruptly, typically very soon after the "Sending 'toggle' message to Guake3" was written.

```
Nov 29 14:34:59 ebba dbus-daemon[9250]: apparmor="DENIED" operation="dbus_method_call" bus="session" path="/org/gnome/Mutter/IdleMonitor/Core" interface="org.gnome.Mutter.IdleMonitor" member="GetIdletime" mask="send" name=":1.38" pid=143979 label="snap.firefox.firefox" peer_pid=9427 peer_label="unconfined"
Nov 29 14:35:01 ebba CRON[1919167]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1)
Nov 29 14:36:04 ebba systemd[9229]: Started Application launched by gsd-media-keys.
Nov 29 14:36:04 ebba gsd-media-keys[1919280]: Sending 'toggle' message to Guake3
Nov 29 14:36:19 ebba systemd[9229]: Started Application launched by gsd-media-keys.
Nov 29 14:36:19 ebba gsd-media-keys[1919326]: Sending 'toggle' message to Guake3
```

view in vim showing the undisplayable characters as `^@`:

Guake is a critical part of my workflow and I'm getting a bit desperate to figure this out. I recently built from master and was using that in hopes it might resolve the issue, only to have suffered a crash just now.

**Expected behavior**

System continues to operate normally.

**Actual behavior**

System becomes completely unresponsive.

**To Reproduce**

Frequently use guake on my cursed workstation for about a week.

**My `$ guake --support` output**

$ guake --support

Guake Version: 3.11.dev6

Vte Version: 0.68.0

Vte Runtime Version: 0.68.0

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GTK+ Version: 3.24.33

GDK Backend: