Unexpected Error While Saving Express Data Entry

I am getting an unexpected error whenever I save an express entry. I am running 8.4.5, and I've tried refreshing entities under Environment, but this didn't fix anything. The error I'm getting:
An exception occurred while executing 'UPDATE ConsumablePartExpressSearchIndexAttributes SET ak_part_desc = ? WHERE exEntryID = ?' with params [null, 156]: SQLSTATE[42S22]: Column not found: 1054 Unknown column 'ak_part_desc' in 'field list'

Upon getting this error, I refresh the page, confirm form resubmission, and I am taken back to the view entries page with a success message. The data is saving just fine. Just have no idea why the error is being thrown.

It started doing this for no reason, completely out of the blue.

Is this a bug??

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