Index: openacs-4/packages/acs-subsite/tcl/plpgsql-utility-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-subsite/tcl/plpgsql-utility-procs.tcl,v
diff -u -r1.4 -r1.5
--- openacs-4/packages/acs-subsite/tcl/plpgsql-utility-procs.tcl	10 Jan 2007 21:22:06 -0000	1.4
+++ openacs-4/packages/acs-subsite/tcl/plpgsql-utility-procs.tcl	7 Jul 2011 10:46:02 -0000	1.5
@@ -63,7 +63,7 @@
 	    if { [info exists user_supplied($arg_name)] } {
 		lappend pieces "${prepend}$user_supplied($arg_name)"
 	    } else {
-		if { $arg_default eq "" } {
+		if { $arg_default eq "" || $arg_default eq "null"} {
 		    lappend pieces "NULL"
 		} else {
 		    lappend pieces "'[db_quote $arg_default]'"