Index: openacs-4/packages/xowiki/tcl/chat-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xowiki/tcl/chat-procs.tcl,v
diff -u -r1.54.2.19 -r1.54.2.20
--- openacs-4/packages/xowiki/tcl/chat-procs.tcl	9 Sep 2020 10:22:57 -0000	1.54.2.19
+++ openacs-4/packages/xowiki/tcl/chat-procs.tcl	28 Sep 2020 21:04:04 -0000	1.54.2.20
@@ -438,7 +438,7 @@
       # scripted streaming should work everywhere
       #
       set mode scripted-streaming
-      if {![regexp msie|opera [string tolower [ns_set get [ns_conn headers] User-Agent]]]} {
+      if {![regexp msie|opera [string tolower [ns_set iget [ns_conn headers] User-Agent]]]} {
         #
         # Explorer doesn't expose partial response until request state
         # != 4, while Opera fires onreadystateevent only once. For