Since Joomla 3.7.0, it includes a small plugin that checks server's PHP version and displays a warning if it's not a recent version. If PHP is version 7.1 or lesser, the plugin crashes, rendering the whole /administrator/ backend unusable. Disabling the plugin doesn't fix the issue.

After searching the error, Google returns two useful pages form Joomla's place in GitHub: Just replace the code from the second page into: /public_html/plugins/quickicon/phpversioncheck/phpversioncheck.php and it will work again.

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