Index: openacs-4/packages/acs-subsite/tcl/subsite-navigation-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-subsite/tcl/subsite-navigation-procs.tcl,v
diff -u -r1.3.10.4 -r1.3.10.5
--- openacs-4/packages/acs-subsite/tcl/subsite-navigation-procs.tcl	18 Sep 2015 07:21:07 -0000	1.3.10.4
+++ openacs-4/packages/acs-subsite/tcl/subsite-navigation-procs.tcl	22 Apr 2017 13:39:09 -0000	1.3.10.5
@@ -175,8 +175,13 @@
         set navigation_id ""
     }
 
+    set joined_url [file join $base_url $info(url)]
+    if {[string index $info(url) end] eq "/"} {
+        append joined_url /
+    }
+    
     template::multirow append $multirow \
-        $group $info(label) [file join $base_url $info(url)] \
+        $group $info(label) $joined_url \
         "" $info(title) "" $info(accesskey) "" $navigation_id [template::multirow size $multirow] \
         $info(name) $parent $info(display_template)