Hi,
Thank you for the details!
The issue seems to be the one you have copy/pasted here. The plugin tries to resolve the “load more results” feature from the elementor posts widget, but it fails at some point during an existence check code.
For now, you can very likely resolve this by turning off the elementor widget infinite loader to a pagination instead. It is generally recommended, it has a much better compatibility. The infinite loader is very hard to handle.
I will debug through this issue on a local server, and will try to figure it out for the upcoming release.