crash when delete QTreeWidgetItem*

[evgenM]

my code:

QList<QTreeWidgetItem*>::iterator itd = itemsToDelete.begin();
while (itd != itemsToDelete.end())
{
  QTreeWidgetItem* twi_ = *itd;
  if (!twi_->childCount())
  {
     cout <<twi_<<"-"<<twi_->childCount()<<endl; //log1
     cout <<twi_->text(0).toStdString()<<endl; //log2
     delete twi_;
     twi_ = 0;
     //twi_->setText(0, "ChangeText"); //if comment "delete twi_;" this line work
     cout <<"ok"<<endl;
     itd = itemsToDelete.erase(itd);
     cout <<"from List ok"<<endl;
   }
   else
       ++itd;
}

QList<QTreeWidgetItem*>::iterator itd = itemsToDelete.begin();
while (itd != itemsToDelete.end())
{
  QTreeWidgetItem* twi_ = *itd;
  if (!twi_->childCount())
  {
     cout <<twi_<<"-"<<twi_->childCount()<<endl; //log1
     cout <<twi_->text(0).toStdString()<<endl; //log2
     delete twi_;
     twi_ = 0;
     //twi_->setText(0, "ChangeText"); //if comment "delete twi_;" this line work
     cout <<"ok"<<endl;
     itd = itemsToDelete.erase(itd);
     cout <<"from List ok"<<endl;
   }
   else
       ++itd;
}

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now program log:
log1: 0x41617880-0 //normal - no children
log2: itemText // it's right too;

on line "delete twi_;" program crash (debugger mark this line too)
why it can be possible?

P.S my qt version 4.1.4
more precise: crashing only for non topLevelItems