Strange error in IDLE

[Shagshag]

Well i do that :

----

Python 2.2.1 (#34, Apr  9 2002, 19:34:33) [MSC 32 bit (Intel)] on win32
Type "copyright", "credits" or "license" for more information.
IDLE 0.8 -- press F1 for help
>>> def get_openingTag(node):
    """
    """
    global SPECIALS_CHARS
    #if node.nodeType == node.ELEMENT_NODE:
    tmp = node.toxml()
    tmp = remove_chars(tmp, SPECIALS_CHARS)
    opening_tag = tmp[:tmp.index('>')] + '>'
    return opening_tag

----

then press return type "get_openingTag("

and then it do that before i go further :

----

>>> Exception in Tkinter callback
Traceback (most recent call last):
  File "D:\Python22\lib\lib-tk\Tkinter.py", line 1292, in __call__
    return apply(self.func, args)
  File "D:\PYTHON22\Tools\idle\CallTips.py", line 51, in paren_open_event
    arg_text = get_arg_text(self.get_object_at_cursor())
  File "D:\PYTHON22\Tools\idle\CallTips.py", line 148, in get_arg_text
    while doc[:1] in " \t\n":
TypeError: 'in <string>' requires character as left operand

----

think there is a bug, no ???