[Zope] Thread in Zope 2.6.2

[Florian Reiser]

Hello,

I've tried to create a thread under Zope as it is described
in Case 2 of http://www.zopelabs.com/cookbook/1058719806 .

The code runs fine until the thread tries to commit the txn
with
    try:
      get_transaction().commit()
      connection.close()
    except:
      pass

In the call connection.close() I get the error
ERROR(200) ZODB A storage error occured during object abort. This shouldn't
happen.
Traceback (innermost last):
  File C:\PROGRA~1\Zope-2~1.2\lib\python\ZODB\Transaction.py, line 401, in
_commit_error
  File C:\PROGRA~1\Zope-2~1.2\lib\python\ZODB\Connection.py, line 658, in
tpc_abort
AttributeError: 'None' object has no attribute 'tpc_abort'

What have I done wrong?

With kind regards
Florian Reiser