I'm getting the same protocol error on Debian

:~$ caffeine

 INFO:root:caffeine is inhibiting desktop idleness
 Protocol error: bad 3 (Window); Sequence Number 11
  Opcode (20, 0) = GetProperty
  Bad resource 0 (0x0)
  at -e line 15.
 INFO:root:caffeine is no longer inhibiting desktop idleness


:~$ uname -a
 Linux #hostname 4.15.0-3-amd64 #1 SMP Debian 4.15.17-1 (2018-04-19) x86_64 
GNU/Linux

Desktop env: xfce4
 Packagelist: https://pastebin.com/mEtQkU6P

Screensaver: xscreensaver
 Packagelist 

 :~$ apt search xscreensaver |grep installed

 xscreensaver/stable,testing,unstable,now 5.36-1 amd64 [installed]
 xscreensaver-data/stable,testing,unstable,now 5.36-1 amd64 [installed]

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https://bugs.launchpad.net/bugs/1700419

Title:
  caffeine 2.9.4 isn't working on Ubuntu 16.04

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