Index: openacs-4/packages/acs-tcl/tcl/acs-cache-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-tcl/tcl/acs-cache-procs.tcl,v
diff -u -N -r1.10.2.19 -r1.10.2.20
--- openacs-4/packages/acs-tcl/tcl/acs-cache-procs.tcl	13 Oct 2021 19:18:14 -0000	1.10.2.19
+++ openacs-4/packages/acs-tcl/tcl/acs-cache-procs.tcl	12 Nov 2021 08:59:03 -0000	1.10.2.20
@@ -464,7 +464,7 @@
             if {[info exists ${:prefix}]} {
                 if {$pattern eq "*"} {
                     ns_log notice "### dict flush ${:prefix} <$pattern>"
-                    unset ${:prefix}
+                    unset -nocomplain ${:prefix}
                 } elseif {[string first "*" $pattern] != -1} {
                     #
                     # A real pattern with wild-card was provided.