Encoding error

Error calling 'setData' of 'Select Data'
Traceback (most recent call last):
  File "/home/ckazzku/dev/python/orange/Orange/OrangeCanvas/scheme/widgetsscheme.py", line 649, in process_signals_for_widget
    handler(*args)
  File "/home/ckazzku/dev/python/orange/Orange/OrangeWidgets/Data/OWSelectData.py", line 224, in setData
    self.updateValuesStack()
  File "/home/ckazzku/dev/python/orange/Orange/OrangeWidgets/Data/OWSelectData.py", line 545, in updateValuesStack
    selectedItemNames.append(str(self.lbVals.item(i).text()))
UnicodeEncodeError: 'ascii' codec can't encode characters in position 0-13: ordinal not in range(128)
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UnicodeEncodeError                            Traceback (most recent call last):
  File "/home/ckazzku/dev/python/orange/Orange/OrangeWidgets/OWGUI.py", line 1508, in __call__
    self.f(**kwds)
  File "/home/ckazzku/dev/python/orange/Orange/OrangeWidgets/Data/OWSelectData.py", line 339, in lbValsChange
    self.currentVals.append(str(self.lbVals.item(i).text()))
UnicodeEncodeError: 'ascii' codec can't encode characters in position 0-13: ordinal not in range(128)
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UnicodeEncodeError                            Traceback (most recent call last):
  File "/home/ckazzku/dev/python/orange/Orange/OrangeCanvas/scheme/widgetsscheme.py", line 649, in process_signals_for_widget
    handler(*args)
  File "/home/ckazzku/dev/python/orange/Orange/OrangeWidgets/Data/OWSelectData.py", line 224, in setData
    self.updateValuesStack()
  File "/home/ckazzku/dev/python/orange/Orange/OrangeWidgets/Data/OWSelectData.py", line 545, in updateValuesStack
    selectedItemNames.append(str(self.lbVals.item(i).text()))
UnicodeEncodeError: 'ascii' codec can't encode characters in position 0-13: ordinal not in range(128)