Index: openacs-4/packages/xowiki/tcl/form-field-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xowiki/tcl/form-field-procs.tcl,v
diff -u -N -r1.284.2.230 -r1.284.2.231
--- openacs-4/packages/xowiki/tcl/form-field-procs.tcl	12 Nov 2022 17:05:23 -0000	1.284.2.230
+++ openacs-4/packages/xowiki/tcl/form-field-procs.tcl	15 Dec 2022 13:17:42 -0000	1.284.2.231
@@ -2255,7 +2255,7 @@
 
             if {![:istype image]} {
               append href ?filename=[ns_urlencode $fn]
-              if {$revision_id ne ""  && [string is integer $revision_id]} {
+              if {[nsf::is integer $revision_id]} {
                 append href &revision_id=$revision_id
               }
             }