Shell crashed while dragging window to workspace switcher

Affected version

Bug summary

I dragged a Firefox window to the workspace switcher, attempting to move it to another workspace. The session crashed.

Steps to reproduce

1. Have at least 3 workspaces in place
2. Dragged Firefox from the first workspace to the third one (in the workspace switcher)
3. See the crash.

What happened

Shell crashed.

Relevant logs, screenshots, screencasts etc.

backtrace.txt

I also see this in the journal

[feborges@t580 ~]$ journalctl -n 50 --since "1 hour ago" | grep gnome-shell
Apr 09 14:41:03 t580 gnome-shell[1778]: meta_monitor_manager_get_logical_monitor_from_number: assertion '(unsigned int) number < g_list_length (manager->logical_monitors)' failed
Apr 09 14:41:03 t580 gnome-shell[1778]: meta_workspace_get_work_area_for_monitor: assertion 'logical_monitor != NULL' failed
Apr 09 14:41:03 t580 gnome-shell[1778]: meta_monitor_manager_get_logical_monitor_from_number: assertion '(unsigned int) number < g_list_length (manager->logical_monitors)' failed
Apr 09 14:41:03 t580 gnome-shell[1778]: meta_workspace_get_work_area_for_monitor: assertion 'logical_monitor != NULL' failed
Apr 09 14:41:05 t580 systemd[1083]: Started Application launched by gnome-shell.
Apr 09 14:41:05 t580 systemd[1083]: Started Application launched by gnome-shell.