Ah, I realize I may have put this in the wrong place. This is for a generic PDF.

I don't see any nodes in the document. Or, at least, it is not clear that I should be looking elsewhere.

I am scanning PDF version of invoices.  Occasionally, I am getting an error from the third-party software showing 'page node 9118480 is null' and stopping all progress of the scan.  Submitted question to software developer, but I know I am not going to get a useful solution on their end.