v2.0 Crashes One Specific Page

This page goes into a critical error state due to the plugin:

https://michaelgoitein.com/speaking/

I enlisted help from WordPress.com support, and they asked me to share this error with you:

[30-Oct-2023 01:52:32 UTC] PHP Fatal error:  Uncaught Error: Call to a member function getAttribute() on null in /srv/htdocs/wp-content/plugins/simple-lightbox-fslight/classes/RewriteFigureTagsClass.php:349
Stack trace:
#0 /srv/htdocs/wp-content/plugins/simple-lightbox-fslight/classes/RewriteFigureTagsClass.php(160): mvbplugins\fslightbox\RewriteFigureTags->rewriteHTML('\n<p>A selection...')
#1 /wordpress/core/6.3.2/wp-includes/class-wp-hook.php(310): mvbplugins\fslightbox\RewriteFigureTags->changeFigureTagsInContent('\n<p>A selection...')
#2 /wordpress/core/6.3.2/wp-includes/plugin.php(205): WP_Hook->apply_filters('\n<p>A selection...', Array)
#3 /wordpress/plugins/gutenberg/16.9.0/build/block-library/blocks/post-content.php(48): apply_filters('the_content', '<!-- wp:paragra...')
#4 /wordpress/core/6.3.2/wp-includes/class-wp-block.php(258): gutenberg_render_block_core_post_content(Array, '<!-- wp:paragra...', Object(WP_Block))
#5 /wordpress/core/6.3.2/wp-includes/class-wp-block.php(244): WP_Block->render()
#6 /wordpress/core/6.3.2/wp-includes/blocks.php(1133): WP_Block->render()
#7 /wordpress/core/6.3.2/wp-includes/blocks.php(1171): render_block(Array)
#8 /wordpress/core/6.3.2/wp-includes/block-template.php(231): do_blocks('<!-- wp:templat...')
#9 /wordpress/core/6.3.2/wp-includes/template-canvas.php(12): get_the_block_template_html()
#10 /wordpress/core/6.3.2/wp-includes/template-loader.php(106): include('/wordpress/core...')
#11 /wordpress/core/6.3.2/wp-blog-header.php(19): require_once('/wordpress/core...')
#12 /wordpress/core/6.3.2/index.php(17): require('/wordpress/core...')
#13 {main}
  thrown in /srv/htdocs/wp-content/plugins/simple-lightbox-fslight/classes/RewriteFigureTagsClass.php on line 349

The page I need help with: [log in to see the link]