“the errors (…) don’t show a stack trace” – they would if you were using xdebug.
It means $wpdb is not loaded yet, not loaded properly, or gone:
- If you added code that calls it to your wp-config file or something to that order, remove it.
- If you’ve a db.php file in wp-content, it’s probably broken so rename it.
- If you’re messing around with things on a shutdown handler, do them earlier on the shutdown hook instead.
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