Uncaught TypeError: Cannot read property ‘firstChild’ of null after upgrading to WordPress 5.5

This was fixed in 5.5.1, commit 48877:

Correct the check for reply element existence in comment-reply.js.

document.getElementById() returns null if no matching element was found, so the previous comparison didn’t work as expected.

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