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Reproduced in a console window:
C:\>c:\python31\python.exe -m idlelib.idle
Exception in Tkinter callback
Traceback (most recent call last):
 File "c:\python31\lib\tkinter\__init__.py", line 1399, in __call__
 return self.func(*args)
 File "c:\python31\lib\idlelib\IOBinding.py", line 177, in open
 self.editwin.flist.open(filename)
AttributeError: 'NoneType' object has no attribute 'flist'