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 -r1.67.2.46 -r1.67.2.47
--- openacs-4/packages/xotcl-request-monitor/tcl/throttle_mod-procs.tcl	5 Jan 2022 14:10:22 -0000	1.67.2.46
+++ openacs-4/packages/xotcl-request-monitor/tcl/throttle_mod-procs.tcl	25 Feb 2022 14:01:56 -0000	1.67.2.47
@@ -1571,9 +1571,9 @@
 
     # Create the file to load. This is per hour = 60*3 + 2 lines
     set number_of_lines [expr {182 * [trend-elements]}]
-    exec $tail -n $number_of_lines ${logdir}/counter.log >${logdir}/counter-new.log
 
     try {
+      exec $tail -n $number_of_lines ${logdir}/counter.log >${logdir}/counter-new.log
       set f [open $logdir/counter-new.log]
       while {-1 != [gets $f line]} {
         regexp {(.*) -- (.*) ::(.*) (.*)} $line match timestamp server counter value
@@ -1585,10 +1585,14 @@
           set complain($counter) 1
         }
       }
+    } on error {errorMsg} {
+      ns_log Warning "+++ request-monitor: error initializing counters: $errorMsg"
     } finally {
-      close $f
+      if {[info exists f]} {
+        close $f
+        unset f
+      }
     }
-    unset f
   }
 
   #