As mtp1960 pointed out on the forum. There is a oddity with the Dashboard widget.
The query for one of the stats is wrong and causes an error. This is NOT a serious problem. If you want you can easily fix it. If not, just leave it… And it will be fixed in the next release.
The fix:
in wp-adrotate-widget.php on line 257 remove
WHERE `tracker` = 'Y'
from the query.
Save and overwrite the old file. And you’re done. It’s easy.
Again, if you don’t want or cannot fix it. No worries. Just a readout going wrong. Nothing serious!
