Website crash after wrong code

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I added a set of PHP code lines that I wasn’t sure if it will run. It got activated, and one I move away from the webpage, there comes a crash on the website.

I then have removed Code Snippet temporarily via FTP, and the website is back on. Then, when I try to reinstall this plugin from WordPress.org’s depository, I experience crash again.

I guess the wrong PHP code is still alive somewhere in /wordpress, and whenever Code Snippet is running, it also runs and creates crash.

Can anyone help me to remove the problematic code running at the back of the scene?

 

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