Index: openacs-4/packages/acs-templating/tcl/head-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-templating/tcl/head-procs.tcl,v
diff -u -N -r1.20.2.13 -r1.20.2.14
--- openacs-4/packages/acs-templating/tcl/head-procs.tcl	2 Oct 2016 16:40:25 -0000	1.20.2.13
+++ openacs-4/packages/acs-templating/tcl/head-procs.tcl	14 Oct 2016 20:43:46 -0000	1.20.2.14
@@ -819,9 +819,10 @@
 
     if {[info exists id]} {
         template::add_body_script -script [subst {
-            document.getElementById('$id').addEventListener('$event', function (event) {
-                $prevent$script
-            }, $usecapture_p);
+            var e = document.getElementById('$id');
+            if (e !== null) {
+                e.addEventListener('$event', function (event) {$prevent$script}, $usecapture_p);
+            }
         }]
     } else {
         template::add_body_script -script [subst {