QTableView, Openpersistenteditor, inputmethod in chinese, crashed

In model/view program, such as Qt official demo "spinboxdelegate" in C:\Qt\Qt5.10.0\Examples\Qt-5.10.0\widgets\itemviews\spinboxdelegate

if  openpersistenteditor function is used ,the application will crash.

1) openpersistenteditor in some cells for example in cell (0,0)
2) microsoft pinyin , windows 10, Qt mingw 5.9.1 later version (5.9.1 ok)
3) input chinese words in cells (1,1) ,do not input in cells having persistenteditor
4) crash!

Test with Qt official demo "spinboxdelegate" in C:\Qt\Qt5.10.0\Examples\Qt-5.10.0\widgets\itemviews\spinboxdelegate

main.cpp

int main(...)

{

...

//add this sentence , input some words using microsoft pinyin in cell (0,0), then crash!

tableView.openPersistentEditor(model.index(0,1)); 

tableView.setWindowTitle(QObject::tr("Spin Box Delegate"));

....
 }