Index: openacs-4/packages/xotcl-core/tcl/50-protocol-handler-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xotcl-core/tcl/50-protocol-handler-procs.tcl,v
diff -u -N -r1.11 -r1.12
--- openacs-4/packages/xotcl-core/tcl/50-protocol-handler-procs.tcl	21 Oct 2017 13:07:27 -0000	1.11
+++ openacs-4/packages/xotcl-core/tcl/50-protocol-handler-procs.tcl	17 Jan 2018 21:50:57 -0000	1.12
@@ -63,7 +63,7 @@
     # developer support will add all its output to a single var, which
     # can lead easily to running out of resources in busy sites. When
     # unset, the developer support will create its own id.
-    catch {unset ::ad_conn(request)}
+    unset -nocomplain ::ad_conn(request)
     set :uri [ns_urldecode [ns_conn url]]
     if {[string length ${:uri}] < [string length ${:url}]} {append :uri /}
     set url_regexp "^${:url}"