Index: openacs-4/packages/acs-authentication/tcl/sync-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-authentication/tcl/sync-procs.tcl,v
diff -u -r1.34.6.1 -r1.34.6.2
--- openacs-4/packages/acs-authentication/tcl/sync-procs.tcl	25 Aug 2013 20:00:12 -0000	1.34.6.1
+++ openacs-4/packages/acs-authentication/tcl/sync-procs.tcl	30 Sep 2013 18:26:48 -0000	1.34.6.2
@@ -511,7 +511,7 @@
 } {
     Purge jobs that are older than KeepBatchLogDays days.
 } {
-    if { ![exists_and_not_null num_days] } {
+    if { $num_days eq "" } {
         set num_days [parameter::get_from_package_key \
                           -parameter KeepBatchLogDays \
                           -package_key "acs-authentication" \