JavaScript TypeError: Cannot read property 'style' of null

Question

I have JavaScript code and below line has problem.

if ((hr==20)) document.write(\"Good Night\"); document.getElementById(\'Night).style.display=\'\'
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Answer 1

simply I think you are missing a single quote in your code

if ((hr==20)) document.write("Good Night"); document.getElementById('Night"here").style.display=''

it should be like this

if ((hr==20)) document.write("Good Night"); document.getElementById('Night').style.display=''