diff --git a/lib/formslib.php b/lib/formslib.php
index f4930bd8980..8fc5a7e0e7d 100644
--- a/lib/formslib.php
+++ b/lib/formslib.php
@@ -2233,9 +2233,11 @@ function validate_' . $this->_formName . '_' . $escapedElementName . '(element,
   ret = validate_' . $this->_formName . '_' . $escapedElementName.'(frm.elements[\''.$elementName.'\'], \''.$escapedElementName.'\') && ret;
   if (!ret && !first_focus) {
     first_focus = true;
-    Y.Global.fire(M.core.globalEvents.FORM_ERROR, {formid: \''. $this->_attributes['id'] .'\',
-                                                   elementid: \'id_error_'.$escapedElementName.'\'});
-    document.getElementById(\'id_error_'.$escapedElementName.'\').focus();
+    Y.use(\'moodle-core-event\', function() {
+        Y.Global.fire(M.core.globalEvents.FORM_ERROR, {formid: \'' . $this->_attributes['id'] . '\',
+                                                       elementid: \'id_error_' . $escapedElementName . '\'});
+        document.getElementById(\'id_error_' . $escapedElementName . '\').focus();
+    });
   }
 ';
 
diff --git a/lib/yui/build/moodle-core-event/moodle-core-event-debug.js b/lib/yui/build/moodle-core-event/moodle-core-event-debug.js
index cbf3e398621..ca46f73f23b 100644
--- a/lib/yui/build/moodle-core-event/moodle-core-event-debug.js
+++ b/lib/yui/build/moodle-core-event/moodle-core-event-debug.js
@@ -30,7 +30,7 @@ var LOGNAME = 'moodle-core-event';
  */
 M.core = M.core || {};
 
-M.core.event = {
+M.core.event = M.core.event || {
     /**
      * This event is triggered when a page has added dynamic nodes to a page
      * that should be processed by the filter system. An example is loading
@@ -44,7 +44,7 @@ M.core.event = {
     FILTER_CONTENT_UPDATED: "filter-content-updated"
 };
 
-M.core.globalEvents = {
+M.core.globalEvents = M.core.globalEvents || {
     /**
      * This event is triggered when form has an error
      *
@@ -74,15 +74,17 @@ var eventDefaultConfig = {
 // Publish all the events with a standard config.
 var key;
 for (key in M.core.event) {
-    if (M.core.event.hasOwnProperty(key)) {
+    if (M.core.event.hasOwnProperty(key) && Y.getEvent(M.core.event[key]) === null) {
         Y.publish(M.core.event[key], eventDefaultConfig);
     }
 }
 
-//Publish all the global events.
+// Publish global events.
 for (key in M.core.globalEvents) {
-    if (M.core.globalEvents.hasOwnProperty(key)) {
-        Y.Global.publish(M.core.globalEvents[key], Y.merge(eventDefaultConfig, {broadcast: 2}));
+    // Make sure the key exists and that the event has not yet been published. Otherwise, skip publishing.
+    if (M.core.globalEvents.hasOwnProperty(key) && Y.Global.getEvent(M.core.globalEvents[key]) === null) {
+        Y.Global.publish(M.core.globalEvents[key], Y.merge(eventDefaultConfig, {broadcast: true}));
+        Y.log('Global event published: ' + key, 'debug', LOGNAME);
     }
 }
 
diff --git a/lib/yui/build/moodle-core-event/moodle-core-event-min.js b/lib/yui/build/moodle-core-event/moodle-core-event-min.js
index 426af2f01e0..ced026ee1a2 100644
--- a/lib/yui/build/moodle-core-event/moodle-core-event-min.js
+++ b/lib/yui/build/moodle-core-event/moodle-core-event-min.js
@@ -1 +1 @@
-YUI.add("moodle-core-event",function(e,t){var n="moodle-core-event";M.core=M.core||{},M.core.event={FILTER_CONTENT_UPDATED:"filter-content-updated"},M.core.globalEvents={FORM_ERROR:"form_error"};var r={emitFacade:!0,defaultFn:function(e){},preventedFn:function(e){},stoppedFn:function(e){}},i;for(i in M.core.event)M.core.event.hasOwnProperty(i)&&e.publish(M.core.event[i],r);for(i in M.core.globalEvents)M.core.globalEvents.hasOwnProperty(i)&&e.Global.publish(M.core.globalEvents[i],e.merge(r,{broadcast:2}))},"@VERSION@",{requires:["event-custom"]});
+YUI.add("moodle-core-event",function(e,t){var n="moodle-core-event";M.core=M.core||{},M.core.event=M.core.event||{FILTER_CONTENT_UPDATED:"filter-content-updated"},M.core.globalEvents=M.core.globalEvents||{FORM_ERROR:"form_error"};var r={emitFacade:!0,defaultFn:function(e){},preventedFn:function(e){},stoppedFn:function(e){}},i;for(i in M.core.event)M.core.event.hasOwnProperty(i)&&e.getEvent(M.core.event[i])===null&&e.publish(M.core.event[i],r);for(i in M.core.globalEvents)M.core.globalEvents.hasOwnProperty(i)&&e.Global.getEvent(M.core.globalEvents[i])===null&&e.Global.publish(M.core.globalEvents[i],e.merge(r,{broadcast:!0}))},"@VERSION@",{requires:["event-custom"]});
diff --git a/lib/yui/build/moodle-core-event/moodle-core-event.js b/lib/yui/build/moodle-core-event/moodle-core-event.js
index 2a9e77668ce..6a18fe68aa4 100644
--- a/lib/yui/build/moodle-core-event/moodle-core-event.js
+++ b/lib/yui/build/moodle-core-event/moodle-core-event.js
@@ -30,7 +30,7 @@ var LOGNAME = 'moodle-core-event';
  */
 M.core = M.core || {};
 
-M.core.event = {
+M.core.event = M.core.event || {
     /**
      * This event is triggered when a page has added dynamic nodes to a page
      * that should be processed by the filter system. An example is loading
@@ -44,7 +44,7 @@ M.core.event = {
     FILTER_CONTENT_UPDATED: "filter-content-updated"
 };
 
-M.core.globalEvents = {
+M.core.globalEvents = M.core.globalEvents || {
     /**
      * This event is triggered when form has an error
      *
@@ -71,15 +71,16 @@ var eventDefaultConfig = {
 // Publish all the events with a standard config.
 var key;
 for (key in M.core.event) {
-    if (M.core.event.hasOwnProperty(key)) {
+    if (M.core.event.hasOwnProperty(key) && Y.getEvent(M.core.event[key]) === null) {
         Y.publish(M.core.event[key], eventDefaultConfig);
     }
 }
 
-//Publish all the global events.
+// Publish global events.
 for (key in M.core.globalEvents) {
-    if (M.core.globalEvents.hasOwnProperty(key)) {
-        Y.Global.publish(M.core.globalEvents[key], Y.merge(eventDefaultConfig, {broadcast: 2}));
+    // Make sure the key exists and that the event has not yet been published. Otherwise, skip publishing.
+    if (M.core.globalEvents.hasOwnProperty(key) && Y.Global.getEvent(M.core.globalEvents[key]) === null) {
+        Y.Global.publish(M.core.globalEvents[key], Y.merge(eventDefaultConfig, {broadcast: true}));
     }
 }
 
diff --git a/lib/yui/src/event/js/event.js b/lib/yui/src/event/js/event.js
index 6f6a28adb9d..5a51c2a1ef9 100644
--- a/lib/yui/src/event/js/event.js
+++ b/lib/yui/src/event/js/event.js
@@ -28,7 +28,7 @@ var LOGNAME = 'moodle-core-event';
  */
 M.core = M.core || {};
 
-M.core.event = {
+M.core.event = M.core.event || {
     /**
      * This event is triggered when a page has added dynamic nodes to a page
      * that should be processed by the filter system. An example is loading
@@ -42,7 +42,7 @@ M.core.event = {
     FILTER_CONTENT_UPDATED: "filter-content-updated"
 };
 
-M.core.globalEvents = {
+M.core.globalEvents = M.core.globalEvents || {
     /**
      * This event is triggered when form has an error
      *
@@ -72,14 +72,16 @@ var eventDefaultConfig = {
 // Publish all the events with a standard config.
 var key;
 for (key in M.core.event) {
-    if (M.core.event.hasOwnProperty(key)) {
+    if (M.core.event.hasOwnProperty(key) && Y.getEvent(M.core.event[key]) === null) {
         Y.publish(M.core.event[key], eventDefaultConfig);
     }
 }
 
-//Publish all the global events.
+// Publish global events.
 for (key in M.core.globalEvents) {
-    if (M.core.globalEvents.hasOwnProperty(key)) {
-        Y.Global.publish(M.core.globalEvents[key], Y.merge(eventDefaultConfig, {broadcast: 2}));
+    // Make sure the key exists and that the event has not yet been published. Otherwise, skip publishing.
+    if (M.core.globalEvents.hasOwnProperty(key) && Y.Global.getEvent(M.core.globalEvents[key]) === null) {
+        Y.Global.publish(M.core.globalEvents[key], Y.merge(eventDefaultConfig, {broadcast: true}));
+        Y.log('Global event published: ' + key, 'debug', LOGNAME);
     }
 }