Wordfence breaks down website

Hello,
I don’t know when the exact and from what this started, but when I’m enabling Wordfence plugin, my entire website header crashes with error codes
Like: `Automatically. Any changes made will be lost. */ $this->failScores[‘sqli’] = 100; $this->failScores[‘xss’] = 100; $this->failScores[‘rce’] = 100; $this->variables[‘sqliRegex’] = new wfWAFRuleVariable($this, ‘sqliRegex’, ‘/(?:[^\\w<]|\\/\\*\\![0-9]*|^)(?: @@HOSTNAME| ALTER|ANALYZE|ASENSITIVE| BEFORE|BENCHMARK|BETWEEN|BIGINT|BINARY|BLOB| CALL|CASE|CHANGE|CHAR|CHARACTER|CHAR_LENGTH|COLLATE|COLUMN|CONCAT|CONDITION|CONSTRAINT|CONTINUE|CONVERT|CREATE|CROSS|CURRENT_DATE|CURRENT_TIME|CURRENT_TIMESTAMP|CURRENT_USER|CURSOR|
/////
/wp-admin/includes/misc.php on line 1126`

and so on, here is just a screen from this:https://layher-baltic.eu/Capture.png

There is no other antivirus plugins on my website. When I’m turning off plugin, everything goes back to normal. Any suggestions?