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Traceback (most recent call last):
File "/base/python_runtime/python_lib/versions/1/google/appengine/ext/webapp/__init__.py", line 515, in __call__
handler.get(*groups)
File "/base/data/home/apps/v2ex/1.349072581769398658/topic.py", line 413, in get
if topic.member_num == member.num:
AttributeError: 'NoneType' object has no attribute 'member_num'