SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'node_uid' cannot be null

I don't know if this is an issue with Better Statistics or another module, but posting it here in case others are having similar errors as it seems to have maybe, maybe, started up in the last 2 months of module updates (not exactly sure):

Type better statistics
Date Monday, January 19, 2015 - 7:50pm
User XXXXXXXXXXXXXXXXXXXXX
Location http://XXXXXXXXXXXXXXX/admin/reports/dblog
Referrer http://XXXXXXXXXXXXXXX/admin/reports/dblog
Message

There was an error collecting statistics data:

SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'node_uid' cannot be null

Severity error
Hostname XXXXXXXXXXXXXXX
Operations

My site is in maintenance mode, don't know if that's part of the issue. Any ideas?