Also affects Scroll Word Exporter, when using the placeholders in the export property "File Options > Export filename".
Steps to reproduce:
Create a new Scroll PDF template
Go to "Document sections" and open the placeholder dialog
Select a placeholder that has editable attributes, for example the Table of contents placeholder
Edit one of the placeholder values, for example the "Max Levels" attribute
Placeholder value is changed
Dialog crashes and displays only a blank state. Error is printed in the browser console:
Downgrade to Scroll PDF version 4.7.0 or earlier.