ValueError: Combo box does not contain item 'sepal length'

[JakaKokosar]

https://sentry.io/organizations/biolab/issues/2734162235/?referrer=github_plugin

ValueError:  Combo box does not contain item 'sepal length'
(5 additional frame(s) were not displayed)
...
  File "owkmeans.py", line 187, in __init__
    self._create_variables_box()
  File "owkmeans.py", line 216, in _create_variables_box
    gui.comboBox(
  File "gui.py", line 474, in comboBox
    return gui_comboBox(*args, **kwargs)
  File "gui.py", line 1642, in comboBox
    callfront.action(cindex)
  File "gui.py", line 2108, in action
    raise ValueError("Combo box does not contain item " + repr(value))

[janezd]

Fixed in 0f1cdf248bd14db472560bcec628e1a563a2208e.