[FIXED JENKINS-15494] Uncaught TypeError: Cannot read property 'firstChild' of null

changelog.html

@@ -65,6 +65,9 @@ Upcoming changes</a>
   <li class=bug>
     NPE from <code>PluginManager</code>.
     (<a href="https://issues.jenkins-ci.org/browse/JENKINS-15511">issue 15511</a>)
+  <li class=bug>
+    <code>Uncaught TypeError: Cannot read property 'firstChild' of null</code> breaks certain forms at least on Chrome.
+    (<a href="https://issues.jenkins-ci.org/browse/JENKINS-15494">issue 15494</a>)
   <li class=rfe>
     Added "manage old data" permanently to the "manage Jenkins" page.
   <li class=rfe>

war/src/main/webapp/scripts/hudson-behavior.js

@@ -499,7 +499,7 @@ function renderOnDemand(e,callback,noBehaviour) {
         if (contextTagName=="TBODY") {
             c = document.createElement("DIV");
             c.innerHTML = "<TABLE><TBODY>"+t.responseText+"</TBODY></TABLE>";
-            c = c.firstChild.firstChild;
+            c = c./*JENKINS-15494*/lastChild.firstChild;
         } else {
             c = document.createElement(contextTagName);
             c.innerHTML = t.responseText;