When upgrading from 6.8.10 to 7.2 and higher the upgrade_6.8.10-6.99.0 script raises a fatal error, and as a result causes a chainreaction of sql errors (because of unfinished upgrade scripts).

This is due to a change somewhere in the code that uses a column called lastExportedAs which is not introduced until 7.2.0. 

First upgrading to 7.1.3 fixes the issue, but it is not mentioned in the gotcha.txt. I would fix the bug if only I knew where in the file it should be placed. Also a notice on getwebgui.com might be a good idea.