When restoring a backup course that includes a database module I see the following error.
Notice: Undefined index: RATINGS in C:\projects\VLE\Mobile Moodle\environments\xampplite-win32-1.6.6.exe\development\offlinemoodle-0.4\htdocs\moodle\mod\data\restorelib.php on line 380

Notice: Undefined index: COMMENTS in C:\projects\VLE\Mobile Moodle\environments\xampplite-win32-1.6.6.exe\development\offlinemoodle-0.4\htdocs\moodle\mod\data\restorelib.php on line 406

I have the developer debug options enabled. I don't believe this shows up otherwise.

Should a simple fix in each case. Just needs a check to see if the parameter exists before using it's children