Description:
When attempting to generate a Table of Contents in a Writer document with customized heading styles and specific formatting options, LibreOffice Writer crashes unexpectedly. This issue occurs consistently when the document contains a large number of headings and subheadings with complex formatting

Steps to Reproduce:
1. Create a new Writer document.
2. Apply custom heading styles to various sections of the document.
3. Insert a Table of Contents using the Insert menu.
4. Choose specific formatting options for the Table of Contents.
5. LibreOffice Writer crashes when attempting to generate the Table of Contents.

Actual Results:
LibreOffice Writer crashes when attempting to generate the Table of Contents with specific formatting options applied to custom heading styles.

Expected Results:
The Table of Contents should be generated without causing LibreOffice Writer to crash, regardless of the document's complexity or formatting options.


Reproducible: Always


User Profile Reset: No

Additional Info:
The Table of Contents should be generated without causing LibreOffice Writer to crash, regardless of the document's complexity or formatting options. But LibreOffice Writer crashes when attempting to generate the Table of Contents with specific formatting options applied to custom heading styles.