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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.
Correct the check for reply element existence in comment-reply.js.
comment-reply.js.
document.getElementById() returns null if no matching element was found, so the previous comparison didn't work as expected.
document.getElementById()
null
