here’s another instance of that null user-id crash in netlogo.
i was using 5.2 on mac (host) and windows (clients) for reasons that i won’t go 
into here.
there was one client that i asked not to re-join the simulation, and the crash 
did not recur
that is not conclusive proof that it was due to this client. 
but the client was running on a microsoft surface
-c

error (NullPointerException)
 while observer running ASK
  called by procedure LISTEN-CLIENTS
  called by procedure GO
  called by Button 'go'

NetLogo is unable to supply you with more details about this error.  Please 
report the problem
at https://github.com/NetLogo/NetLogo/issues, or to [email protected], 
and paste the
contents of this window into your report.

java.lang.NullPointerException
 at org.nlogo.prim._asm_procedurelistenclients_equal_8.report(:1)
 at org.nlogo.nvm.Context.evaluateReporter(Context.java:227)
 at org.nlogo.prim._asm_procedurelistenclients_ask_7.perform(:2)
 at org.nlogo.nvm.Context.stepConcurrent(Context.java:91)
 at org.nlogo.nvm.ConcurrentJob.step(ConcurrentJob.java:82)
 at 
org.nlogo.job.JobThread.org$nlogo$job$JobThread$$runPrimaryJobs(JobThread.scala:143)
 at org.nlogo.job.JobThread$$anonfun$run$1.apply$mcV$sp(JobThread.scala:78)
 at org.nlogo.job.JobThread$$anonfun$run$1.apply(JobThread.scala:76)
 at org.nlogo.job.JobThread$$anonfun$run$1.apply(JobThread.scala:76)
 at scala.util.control.Exception$Catch.apply(Exception.scala:88)
 at org.nlogo.util.Exceptions$.handling(Exceptions.scala:41)
 at org.nlogo.job.JobThread.run(JobThread.scala:75)

NetLogo 5.2.0
main: org.nlogo.app.AppFrame
thread: JobThread
Java HotSpot(TM) 64-Bit Server VM 1.6.0_65 (Apple Inc.; 
1.6.0_65-b14-462-11M4609)
operating system: Mac OS X 10.9.5 (x86_64 processor)
Scala version 2.9.2
JOGL: (3D View not initialized)
OpenGL Graphics: (3D View not initialized)
model: Disease HubNet

02:51:36.102 SwitchedTabsEvent (org.nlogo.app.Tabs) AWT-EventQueue-0
02:51:36.100 RuntimeErrorEvent (org.nlogo.app.App$$anon$1 
(org.nlogo.window.GUIWorkspace)) AWT-EventQueue-0
02:51:36.100 AddJobEvent (org.nlogo.window.ButtonWidget) AWT-EventQueue-0
02:51:36.023 InputBoxLoseFocusEvent (org.nlogo.window.ButtonWidget) 
AWT-EventQueue-0
02:51:36.021 InterfaceGlobalEvent (org.nlogo.app.InterfacePanel$2 
(org.nlogo.window.SliderWidget)) AWT-EventQueue-0
02:51:36.021 InterfaceGlobalEvent (org.nlogo.app.InterfacePanel$2 
(org.nlogo.window.SliderWidget)) AWT-EventQueue-0
02:51:36.021 InterfaceGlobalEvent (org.nlogo.app.InterfacePanel$2 
(org.nlogo.window.SliderWidget)) AWT-EventQueue-0
02:51:36.021 InterfaceGlobalEvent (org.nlogo.widget.SwitchWidget) 
AWT-EventQueue-0
02:51:36.021 InterfaceGlobalEvent (org.nlogo.widget.SwitchWidget) 
AWT-EventQueue-0
02:51:36.021 InterfaceGlobalEvent (org.nlogo.app.InterfacePanel$2 
(org.nlogo.window.SliderWidget)) AWT-EventQueue-0

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