Index: openacs-4/packages/acs-tcl/tcl/security-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-tcl/tcl/security-procs.tcl,v
diff -u -N -r1.126.2.10 -r1.126.2.11
--- openacs-4/packages/acs-tcl/tcl/security-procs.tcl	25 Mar 2019 18:38:49 -0000	1.126.2.10
+++ openacs-4/packages/acs-tcl/tcl/security-procs.tcl	24 Apr 2019 16:29:23 -0000	1.126.2.11
@@ -1361,7 +1361,7 @@
 } {
 
     set cookie_value [ad_get_cookie -include_set_cookies $include_set_cookies $name]
-    if { $cookie_value eq "" } {
+    if { $cookie_value eq "" || ![string is list $cookie_value]} {
         throw {AD_EXCEPTION NO_COOKIE} {Cookie does not exist}
     }
 
@@ -1392,7 +1392,7 @@
 } {
 
     set cookie_value [ad_get_cookie -include_set_cookies $include_set_cookies $name]
-    if { $cookie_value eq "" } {
+    if { $cookie_value eq "" || ![string is list $cookie_value]} {
         throw {AD_EXCEPTION NO_COOKIE} {Cookie does not exist}
     }