Index: openacs-4/packages/xowiki/tcl/includelet-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xowiki/tcl/includelet-procs.tcl,v
diff -u -N -r1.239.2.71 -r1.239.2.72
--- openacs-4/packages/xowiki/tcl/includelet-procs.tcl	29 Jul 2021 17:27:01 -0000	1.239.2.71
+++ openacs-4/packages/xowiki/tcl/includelet-procs.tcl	9 Aug 2021 09:55:57 -0000	1.239.2.72
@@ -2491,7 +2491,7 @@
              //console.log('have href ' + href + ' c=' + c);
 
              var transaction = YAHOO.util.Connect.asyncRequest('GET', \
-                 href + '?template_file=view-page&return_url=' + href,
+                 href + '?template_file=view-page&return_url=' + encodeURI(href),
                 {
                   success:function(o) {
                      var bookpage = document.getElementById('book-page');