I don't have light-locker installed, using GDM3 instead, and just
upgraded to Bionic, but this bug appears to have reared it's ugly head
again. The solution however of changing IgnoreLid to true in UPower.conf
clears up the problem. Hats off to piotr-wroclaw for figuring this out.

This solution also doesn't affect any of the other desktops I have
installed, which is Gnome 3 and Unity. All three desktops now suspend
and resume correctly as expected when closing the lid. Just remember to
reboot so the settings take affect.

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  XFCE 4.12 Black screen after wakeup from suspending by closing the
  laptop lid

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