[Zope] error adding property of type lines in root-folder

[Nico Grubert]

hello,

i am adding a property "colors" of type lines with empty value in
root-directory.
okay this works fine, but if i enter some values in the textarea for
this property and i click "save changes"
i get this error:

***************************************************************
Zope Error
Zope has encountered an error while publishing this resource. 

Error Type: TypeError
Error Value: string member test needs char left operand



--------------------------------------------------------------------------------

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Traceback (innermost last):
  File C:\Program Files\ZOPE\lib\python\ZPublisher\Publish.py, line 214,
in publish_module
  File C:\Program Files\ZOPE\lib\python\ZPublisher\Publish.py, line 179,
in publish
  File C:\Program Files\ZOPE\lib\python\Zope\__init__.py, line 202, in
zpublisher_exception_hook
    (Object: ApplicationDefaultPermissions)
  File C:\Program Files\ZOPE\lib\python\ZPublisher\Publish.py, line 165,
in publish
  File C:\Program Files\ZOPE\lib\python\ZPublisher\mapply.py, line 160,
in mapply
    (Object: manage_propertiesForm)
  File C:\Program Files\ZOPE\lib\python\ZPublisher\Publish.py, line 102,
in call_object
    (Object: manage_propertiesForm)
  File C:\Program Files\ZOPE\lib\python\App\special_dtml.py, line 120,
in __call__
    (Object: manage_propertiesForm)
    (Info: C:\Program Files\ZOPE\lib\python\OFS/properties.dtml)
  File C:\Program Files\ZOPE\lib\python\DocumentTemplate\DT_String.py,
line 502, in __call__
    (Object: manage_propertiesForm)
  File C:\Program Files\ZOPE\lib\python\DocumentTemplate\DT_In.py, line
691, in renderwob
    (Object: propertyMap)
  File C:\Program Files\ZOPE\lib\python\DocumentTemplate\DT_In.py, line
691, in renderwob
    (Object: _[select_variable])
  File C:\Program Files\ZOPE\lib\python\DocumentTemplate\DT_Util.py,
line 335, in eval
    (Object: _['sequence-item'] in getProperty(id))
    (Info: getProperty)
  File <string>, line 0, in ?
TypeError: (see above)
*************************************

what is going wrong right here ???

thanks in advance
cheers,
nico