Description:
Affects Libreoffice Writer 6.4.0.3 on both Windows and openSUSE Tumbleweed (LO installed from the distribution's official repos).

I've captured a backtrace by following the official tutorial for Linux. There seems to be a segmentation fault. Should you need any other log, do let me know and I'll provide it.

Steps to Reproduce:
1. Open any document in Writer
2. Insert a new text box (click on Insert > Text box)
3. Drag a Text box of any size on the page
4. Release the text box so that the blinking cursor appears (i.e. you're ready to start typing in the box)
5. Click on either "Centered", "Align to right", or "Justified". Even re-clicking on the default "Align to left" will do.

Actual Results:
LibreOffice Writer crashed.

Expected Results:
The cursor should have moved to the right position, depending on the chosen alignment.


Reproducible: Always


User Profile Reset: No


OpenGL enabled: Yes

Additional Info:
Version: 6.4.0.3
Build ID: 40(Build:3)
CPU threads: 4; OS: Linux 5.5; UI render: default; VCL: kf5; 
Locale: it-IT (it_IT.UTF-8); UI-Language: en-US
Calc: threaded