It may be view-specific.
Generally, the error would mean
java heap overflow -- mainly due to
the complexity of a view.
Is it a chance that something
is rendered on a Map?
There is a page of resolved issues for 9.2.4
"465062 In Tableau Server, when you clicked a menu action that linked to a filtered target sheet, an error sometimes occurred: "Tableau Server Error: unable to get property 'length' of undefined or null reference."
Is there a chance this issue came back? Any explanation of what caused it?
You're better to open a case in Tableau Support.