If the document includes a table at the very end, that is long enough to
push the last paragraph into the next page, this will happen and can be very
difficult to clear.

Some things to check:
If you haven't already done so, turn on the feature to view all formatting
marks.  This can be done by clicking the paragraph icon in your toolbars, or
by going to tools/options/view tab and check the "all" box under "Formatting
Marks."  Once you do this, you may see what is on the last page or at the
end of the next to last page that is causing the blank page to appear.

If that doesn't help, try making the top and bottom and/or side margins a
little bit smaller, thereby allowing a little bit more content to fit on the
page.

Let us know how it works out!