Why can't I use it after upgrading PHP7.4

520 error is returned when accessing the edit page.
No effect after clearing the cache.
No effect after reinstallation.

Check your server error logs.

Beaaver Builder works perfectly fine with php 7.4

Oh i found an error log

 [error] 13519#0: *8985 failed to run body_filter_by_lua*: /www/server/speed/speed.lua:633: bad argument #1 to 'find' (string expected, got table) while sending to client, client: 108.***.***.***, server: hoshinagumi.com, request: "GET /?fl_builder HTTP/2.0", upstream: "fastcgi://unix:/tmp/php-cgi-74.sock:", host: "hoshinagumi.com", referrer: "https://hoshinagumi.com/wp-admin/edit.php?post_type=page"

I think I found out what went wrong. A panel plug-in has a problem after the upgrade. Thank you for your guidance.

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