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 -r1.294 -r1.295
--- openacs-4/packages/xowiki/tcl/package-procs.tcl	7 Sep 2017 15:48:27 -0000	1.294
+++ openacs-4/packages/xowiki/tcl/package-procs.tcl	14 Sep 2017 16:13:10 -0000	1.295
@@ -1615,8 +1615,14 @@
         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 "value of summary must be boolean"}
-        if {![string is boolean -strict $popular]} {error "value of popular must be boolean"}
+        if {![string is boolean -strict $summary]} {
+          ad_return_complaint 1 "value of 'summary' must be boolean"
+          ad_script_abort
+        }
+        if {![string is boolean -strict $popular]} {
+          ad_return_complaint 1 "value of 'popular' must be boolean"
+          ad_script_abort
+        }
         set tag_kind [expr {$popular ? "ptag" :"tag"}]
         set weblog_page [my get_parameter weblog_page]
         my get_lang_and_name -default_lang $default_lang -name $weblog_page (lang) (stripped_name)