Defender scan stack at 17% to 20%.

Defender scan stack at 17% to 20%. Error log returned:
PHP Fatal error: Allowed memory size of 536870912 bytes exhausted (tried to allocate 266338312 bytes) in /../wp-content/plugins/wp-defender/app/module/scan/component/token-utils.php on line 77\n', referer: https://....de/wp-admin/admin.php?page=wdf-scan

Memory was increased to 700MB, the same fatal error showed up.