Chrome Version: 67.0.3396.19
OS Version: 10575.17.0

I had emacs open for a while and came back to a session to find the window was gone. Output in the terminal points to a lost connection to the X server (see below). Re-running `emacs` successfully opened a new window.

(emacs:1935): Gtk-CRITICAL **: gtk_widget_destroy: assertion 'GTK_IS_WIDGET (widget)' failed
Connection lost to X server `:0'
When compiled with GTK, Emacs cannot recover from X disconnects.
This is a GTK bug: https://bugzilla.gnome.org/show_bug.cgi?id=85715
For details, see etc/PROBLEMS.
Fatal error 6: Aborted
Backtrace:
emacs[0x500e63]
emacs[0x4e740e]
emacs[0x500ea3]
emacs[0x4bbbcf]
emacs[0x4bbc8d]
/usr/lib/x86_64-linux-gnu/libX11.so.6(_XIOError+0x4e)[0x7aac6b9e32de]
/usr/lib/x86_64-linux-gnu/libX11.so.6(_XEventsQueued+0x7d)[0x7aac6b9e0b3d]
/usr/lib/x86_64-linux-gnu/libX11.so.6(XPending+0x57)[0x7aac6b9d27e7]
/usr/lib/x86_64-linux-gnu/libgdk-3.so.0(+0x67fae)[0x7aac6d827fae]
/lib/x86_64-linux-gnu/libglib-2.0.so.0(g_main_context_prepare+0x15d)[0x7aac6c14cedd]
/lib/x86_64-linux-gnu/libglib-2.0.so.0(+0x4a91b)[0x7aac6c14d91b]
/lib/x86_64-linux-gnu/libglib-2.0.so.0(g_main_context_pending+0x27)[0x7aac6c14dab7]
/usr/lib/x86_64-linux-gnu/libgtk-3.so.0(gtk_events_pending+0xd)[0x7aac6dce4dcd]
emacs[0x4bbd07]
emacs[0x4ee2b9]
emacs[0x4ef935]
emacs[0x4e73dc]
emacs[0x4ff7ae]
emacs[0x500a9d]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x110c0)[0x7aac6844b0c0]
/usr/lib/x86_64-linux-gnu/libX11.so.6(_XEventsQueued+0x12)[0x7aac6b9e0ad2]
/usr/lib/x86_64-linux-gnu/libX11.so.6(XPending+0x57)[0x7aac6b9d27e7]
/usr/lib/x86_64-linux-gnu/libgdk-3.so.0(+0x6801c)[0x7aac6d82801c]
/usr/lib/x86_64-linux-gnu/libgdk-3.so.0(gdk_display_get_event+0x79)[0x7aac6d7f23f9]
/usr/lib/x86_64-linux-gnu/libgdk-3.so.0(+0x67e92)[0x7aac6d827e92]
/lib/x86_64-linux-gnu/libglib-2.0.so.0(g_main_context_dispatch+0x2a7)[0x7aac6c14d7f7]
/lib/x86_64-linux-gnu/libglib-2.0.so.0(+0x4aa60)[0x7aac6c14da60]
/lib/x86_64-linux-gnu/libglib-2.0.so.0(g_main_context_iteration+0x2c)[0x7aac6c14db0c]
/usr/lib/x86_64-linux-gnu/libgtk-3.so.0(gtk_main_iteration+0x15)[0x7aac6dce4df5]
emacs[0x4bbce2]
emacs[0x4ee2b9]
emacs[0x4ef935]
emacs[0x54029a]
emacs[0x560665]
emacs[0x560cc0]
emacs[0x4ecf29]
emacs[0x4ed441]
emacs[0x4ee3d8]
emacs[0x4f16b8]
emacs[0x599bcc]
emacs[0x4eed21]
...
Aborted