Description:
------------
none

Test script:
---------------
<?php

$dom = new DOMDocument();
$dom->loadXML('<root><child/></root>');
$xpath = new DOMXpath($dom);
foreach($xpath->query('/root/noexist') as $child) {
    var_dump($child);
}

Expected result:
----------------
no error

Actual result:
--------------
php: /home/huixinchen/opensource/trunk/Zend/zend_hash.c:2036: zend_hash_internal_pointer_reset_ex: Assertion `(&ht->nInternalPointer != pos || (ht)->gc.refcount == 1) || ((ht)->u.flags & (1<<6))' failed.

Program received signal SIGABRT, Aborted.
0x00007ffff5f685e5 in raise () from /lib64/libc.so.6
(gdb) bt
#0  0x00007ffff5f685e5 in raise () from /lib64/libc.so.6
#1  0x00007ffff5f69dc5 in abort () from /lib64/libc.so.6
#2  0x00007ffff5f6170e in __assert_fail_base () from /lib64/libc.so.6
#3  0x00007ffff5f617d0 in __assert_fail () from /lib64/libc.so.6
#4  0x0000000000a54504 in zend_hash_internal_pointer_reset_ex (ht=0x1530080 <zend_empty_array>,
    pos=0x15300a4 <zend_empty_array+36>) at /home/huixinchen/opensource/trunk/Zend/zend_hash.c:2036
#5  0x0000000000685c71 in php_dom_get_iterator (ce=0x1636300, object=0x7ffff2c200c0, by_ref=0)
    at /home/huixinchen/opensource/trunk/ext/dom/dom_iterators.c:284
#6  0x0000000000ac0d65 in ZEND_FE_RESET_R_SPEC_VAR_HANDLER ()
    at /home/huixinchen/opensource/trunk/Zend/zend_vm_execute.h:16819
#7  0x0000000000b1ee91 in execute_ex (ex=0x7ffff2c20030)
    at /home/huixinchen/opensource/trunk/Zend/zend_vm_execute.h:61331
#8  0x0000000000b22c39 in zend_execute (op_array=0x7ffff2c80300, return_value=0x0)
    at /home/huixinchen/opensource/trunk/Zend/zend_vm_execute.h:64280
#9  0x0000000000a3d2a8 in zend_execute_scripts (type=8, retval=0x0, file_count=3)
    at /home/huixinchen/opensource/trunk/Zend/zend.c:1510
#10 0x00000000009ab1fd in php_execute_script (primary_file=0x7fffffffe130)
    at /home/huixinchen/opensource/trunk/main/main.c:2455
#11 0x0000000000b25508 in do_cli (argc=2, argv=0x1580d50) at /home/huixinchen/opensource/trunk/sapi/cli/php_cli.c:1011
#12 0x0000000000b264a7 in main (argc=2, argv=0x1580d50) at /home/huixinchen/opensource/trunk/sapi/cli/php_cli.c:1404