Why does a segmentation fault occur in qtreewidget?

Question

Qt

Hello! The program crashes on the line

if (ui->treeWidget->hasFocus() && ui->treeWidget->currentItem()->text(0).length() < 25 )

Indicates a segmentation fault.
What could be the problem? The treewidget itself doesn't seem to be empty. qt 4.8.6, Ubuntu 15.04

Answer 1

currentItem() may return null, which is most likely the problem.

Answer 2

Well, if "The treewidget itself seems to be not empty", then either currentItem is empty or text(0)