Warning: Illegal offset type in /var/www/html/wp-includes/option.php on line 1924

I had these exact errors. I updated all the themes and de-activated all my plugins, then re-activated them one by one. Eventually all plugins were reactivated and the errors are gone.

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Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)