This bug was originally marked as duplicate of bug 218624, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related.

Build: NetBeans IDE 7.3 Beta (Build 201210011125)
VM: Java HotSpot(TM) Client VM, 23.3-b01, Java(TM) SE Runtime Environment, 1.7.0_07-b11
OS: Windows 8

User Comments:
GUEST: Clicking on HTML BreadCrumb "radix".

drazisil: Clicked on PHP in the bread crumb

luismercurial: this is in the bottom of netbeans exception

GUEST: clicked HTML breadcrumb on bottom of code window

GUEST: ?????????????PHP???????????
When I click on the navigation bars on the bottom of "PHP>>", appears the error reporting.

luchop00: click on rules icon (yellow package on left-inferior corner)

GUEST: Editing index.php in the source view for index.php 'status bar' has " HTML> HTML>" icons, the second icon doesn't cause an error, clicking on the first HTML > icon brings up an error.

brl4n: Clicked on the new "Rules" icon on the bottom of the editor tabbed window.

davideconsonni: clicked on "html" breadcrumb in a xhtml page

turneliusz: Using bread crumbs to go from some class to "PHP"

st3vie: I was editing a PHP file and I clicked on the first part of the breadcrumbs, below the editor window. The first part of the breadcrumbs is "PHP".

davideconsonni: click on xhtml page

GUEST: In the HTML editor, clicked on an inner <div>, then in the trail at the bottom, clicked on each layer up in turn.
Null pointer occurred with final click on the HTML level.

thilob: had a PHP file open in the editor. Then clicked on the "PHP" breadcrumb in the lower left corner of the editor window.

GUEST: Trying to click and drag the "breadcrumb" to the top of my editor.

st3vie: Working in a PHP project. Clicked on the "PHP" part of the "breadcrumbs" at the bottom underneath the editor.

GUEST: When you click to "PHP" on the bottom of the code editor throws Exception




Stacktrace: 
java.lang.NullPointerException
   at org.netbeans.modules.csl.navigation.BreadCrumbsTask$StructureItemNode$2.open(BreadCrumbsTask.java:176)
   at org.netbeans.modules.editor.breadcrumbs.BreadCrumbComponent.open(BreadCrumbComponent.java:266)
   at org.netbeans.modules.editor.breadcrumbs.BreadCrumbComponent.expand(BreadCrumbComponent.java:223)
   at org.netbeans.modules.editor.breadcrumbs.BreadCrumbComponent.access$000(BreadCrumbComponent.java:89)
   at org.netbeans.modules.editor.breadcrumbs.BreadCrumbComponent$1.mouseClicked(BreadCrumbComponent.java:97)
   at java.awt.Component.processMouseEvent(Component.java:6508)