Index: openacs-4/packages/acs-tcl/tcl/apm-install-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-tcl/tcl/apm-install-procs.tcl,v
diff -u -r1.126.2.12 -r1.126.2.13
--- openacs-4/packages/acs-tcl/tcl/apm-install-procs.tcl	28 Oct 2020 15:39:19 -0000	1.126.2.12
+++ openacs-4/packages/acs-tcl/tcl/apm-install-procs.tcl	1 Feb 2021 10:51:08 -0000	1.126.2.13
@@ -2340,7 +2340,7 @@
             where package_key = :package_key
         } {
             # Removing the character "#".
-            regsub -all {[\#]*} $instance_name {\1} instance_name
+            regsub -all -- {[\#]*} $instance_name {\1} instance_name
 
             # Verifying whether this instance_name is a message_key
             set is_msg [lang::message::message_exists_p [ad_conn locale] $instance_name]