Index: openacs-4/packages/xotcl-request-monitor/tcl/throttle_mod-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xotcl-request-monitor/tcl/throttle_mod-procs.tcl,v
diff -u -N -r1.43.2.15 -r1.43.2.16
--- openacs-4/packages/xotcl-request-monitor/tcl/throttle_mod-procs.tcl	2 Feb 2017 22:14:31 -0000	1.43.2.15
+++ openacs-4/packages/xotcl-request-monitor/tcl/throttle_mod-procs.tcl	28 Feb 2017 09:00:16 -0000	1.43.2.16
@@ -1295,7 +1295,7 @@
     # When old data is restored, don't trust user-info unless it is
     # very recent (e.g. younger than 3 munutes)
     #
-    if {[clock seconds] - [file mtime ${:file}] > 180} {
+    if {[file readable ${:file}] && ([clock seconds] - [file mtime ${:file}] > 180)} {
       Users array unset user_in_community
     }
   }