Description:
------------
- Getting segfault when trying to read assigned class in array or even splStack.

- Using GDB i'm getting one that may help(excluding some echos and dumps)
Program received signal SIGSEGV, Segmentation fault.
0x00000000005e69d8 in zend_std_object_get_class ()


Test script:
---------------
https://gist.github.com/AlexanderC/6075141

This gist is the script that would reproduce the bug

Expected result:
----------------
object(Node)#4 (7) {
  ["children":protected]=>
  array(0) {
  }
  ["parent":protected]=>
  object(Node)#3 (7) {
    ["children":protected]=>
    array(1) {
      [0]=>
      *RECURSION*
    }
    ["parent":protected]=>
    object(Node)#2 (7) {
      ["children":protected]=>
      array(1) {
        [0]=>
        *RECURSION*
      }
      ["parent":protected]=>
      NULL
      ["data":protected]=>
      string(4) "HEAD"
      ["uid":protected]=>
      string(63) 
"a8c3048459faa2d4b4f41acb5a3827675196e96b51f053692308c5.92526655"
      ["index":protected]=>
      int(0)
      ["assureUnique":protected]=>
      bool(false)
      ["storage":"ArrayIterator":private]=>
      array(0) {
      }
    }
    ["data":protected]=>
    string(6) "value1"
    ["uid":protected]=>
    int(1)
    ["index":protected]=>
    int(0)
    ["assureUnique":protected]=>
    bool(false)
    ["storage":"ArrayIterator":private]=>
    array(0) {
    }
  }
  ["data":protected]=>
  string(6) "value2"
  ["uid":protected]=>
  int(2)
  ["index":protected]=>
  int(0)
  ["assureUnique":protected]=>
  bool(false)
  ["storage":"ArrayIterator":private]=>
  array(0) {
  }
}

Actual result:
--------------
Process finished with exit code 139