App crashed when you click the text tips once prediction is activated.

1.platform: Symbian Anna Qt4.7.4 (Nokia Qt SDK).
2.testing steps:
1). start the App program which contains a TextInput QML element on UI.
2). click in the textinput element, the virtual keyboard will be displayed.
3). make the prediction is activated.
4). Input some words, a text tip will be displayed.
5). click the text tip, app will be crashed.