File change Detection no longer working

Stopped getting email alerts awhile ago and manual scans no longer work.

Error details:

id => 180920
module => file_change
type => fatal
code => file-scan-aborted
timestamp => 2019-05-07 17:24:05
init_timestamp => 2019-05-07 17:24:04
remote_ip =>
user_id => [empty string]
url => https://www.site.com/wp-cron.php?doing_wp_cron=1557249543.6526029109954833984375
memory_current => 72044784
memory_peak => 72277008
data => Array
id => file-change-fast
step => get-files
chunk => content