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###!!! ASSERTION: You can't dereference a NULL nsCOMPtr with operator->().: 'mRawPtr != 0', file ../../../../dist/include/nsCOMPtr.h, line 796

Program received signal SIGSEGV, Segmentation fault.
0xb6b7463a in nsTreeContentView::SetTree (this=0xb0ba2510, aTree=0xaaecece0) at layout/xul/base/src/tree/src/nsTreeContentView.cpp:571
571        boxObject->GetElement(getter_AddRefs(element));
(gdb) bt 3
#0  0xb6b7463a in nsTreeContentView::SetTree (this=0xb0ba2510, aTree=0xaaecece0) at layout/xul/base/src/tree/src/nsTreeContentView.cpp:571
#1  0xb736c76f in NS_InvokeByIndex_P () at xpcom/reflect/xptcall/md/unix/xptcinvoke_gcc_x86_unix.cpp:69
#2  0xb6171901 in XPCWrappedNative::CallMethod (ccx=..., mode=XPCWrappedNative::CALL_METHOD)
    at js/src/xpconnect/src/xpcwrappednative.cpp:2722
(More stack frames follow...)
(gdb) list 566
561    nsTreeContentView::SetTree(nsITreeBoxObject* aTree)
562    {
563      ClearRows();
564
565      mBoxObject = aTree;
566
567      if (aTree && !mRoot) {
568        // Get our root element
569        nsCOMPtr<nsIBoxObject> boxObject = do_QueryInterface(mBoxObject);
570        nsCOMPtr<Element> element;
571        boxObject->GetElement(getter_AddRefs(element));
(gdb) p boxObject
$16 = {mRawPtr = 0x0}

|aTree| does not implement |nsIBoxObject|, so |do_QueryInterface(mBoxObject)|
returns null. Then we have |null->GetElement()|.
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<window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
        onload="document.getElementById('tree').view.setTree({});">
<tree id="tree">
  <treechildren/>
</tree>
</window>