Index: openacs-4/packages/xowiki/tcl/package-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xowiki/tcl/package-procs.tcl,v
diff -u -r1.279.2.3 -r1.279.2.4
--- openacs-4/packages/xowiki/tcl/package-procs.tcl	13 Oct 2013 18:13:58 -0000	1.279.2.3
+++ openacs-4/packages/xowiki/tcl/package-procs.tcl	14 Oct 2013 18:39:22 -0000	1.279.2.4
@@ -1408,6 +1408,8 @@
 	set tag $stripped_url
 	set summary [::xo::cc query_parameter summary 0]
 	set popular [::xo::cc query_parameter popular 0]
+	if {$summary eq ""} {set summary 0}
+	if {$popular eq ""} {set popular 0}
 	if {![string is boolean -strict $summary]} {error "summary must be boolean"}
 	if {![string is boolean -strict $popular]} {error "popular must be boolean"}
 	set tag_kind [expr {$popular ? "ptag" :"tag"}]