phpBB 2.0.22 - Invalid ImpExData object (failed on threadid) with numerous threads

[Cars2007]

During import, "Invalid ImpExData Object,..." is thrown many times

Importing 2000 Posts

From : 0 :: To : 235889

Invalid ImpExData object, skipping. Failed on : threadid
Invalid ImpExData object, skipping. Failed on : threadid
Invalid ImpExData object, skipping. Failed on : threadid
Invalid ImpExData object, skipping. Failed on : threadid
Invalid ImpExData object, skipping. Failed on : threadid
Invalid ImpExData object, skipping. Failed on : threadid

Some of the threads do seem to get imported, but there are tons that say the above message.

[Jerry]

This happens when the origional thread has not been imported, most likely because it was deleted and the posts associated with it were not.