I also have the same issue. On Pagespeed insights I get the following error message:
Browser errors were logged to the console
plugins/phastpress/phast.php/c2VydmljZT1idW5kbGVyJnI9NC1lVmpsUHJ0SmMmcj1GUlZ5SHlaVDZVNCZyPVA1WVRFNXR2cXNj.q.js
Failed to load resource: the server responded with a status of 404 (Not Found)