kuleanadesign on "[Plugin: Wordfence Security] Scan can't continue - stored data not found after a fork. Got type: boolean"

Wordfence fails to finish and produces the following error message:

Scan can't continue - stored data not found after a fork. Got type: boolean

After reading threads on this same issue, I enabled debugging mode. Below is the end of the log file where it hangs.

Thanks in advance for your help.

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[Apr 15 16:24:08:1460762648.433810:10:info] SUM_KILLED:A request was received to kill the previous scan.
[Apr 15 16:24:08:1460762648.433064:1:info] Scan kill request received.
[Apr 15 16:22:22:1460762542.095009:4:info] Scan process ended after forking.
[Apr 15 16:22:22:1460762542.053025:2:error] Scan can't continue - stored data not found after a fork. Got type: boolean
[Apr 15 16:22:22:1460762542.049952:4:info] Setting up scanRunning and starting scan
[Apr 15 16:22:22:1460762542.049407:4:info] Setting up error handling environment
[Apr 15 16:22:22:1460762542.048274:4:info] Requesting max memory
[Apr 15 16:22:22:1460762542.047745:4:info] Done become admin
[Apr 15 16:22:22:1460762542.047203:4:info] Scan authentication complete.
[Apr 15 16:22:22:1460762542.044600:4:info] Scan will run as admin user 'kuleana' with ID '1' sourced from: singlesite get_users() function
[Apr 15 16:22:22:1460762542.042619:4:info] Becoming admin for scan
[Apr 15 16:22:22:1460762542.042052:4:info] Checking saved cronkey against cronkey param
[Apr 15 16:22:22:1460762542.041482:4:info] Exploding stored cronkey
[Apr 15 16:22:22:1460762542.037737:4:info] Fetching stored cronkey for comparison.
[Apr 15 16:22:22:1460762542.037178:4:info] Checking cronkey
[Apr 15 16:22:22:1460762542.036481:4:info] Scan engine received request.
[Apr 15 16:22:21:1460762541.093743:4:info] Starting cron with normal ajax at URL http://www.brierdunn.com/wp-admin/admin-ajax.php?action=wordfence_doScan&isFork=1&cronKey=460297c3345051b4f738c90
[Apr 15 16:22:21:1460762541.091886:4:info] Test result of scan start URL fetch: array ( 'headers' => array ( 'date' => 'Fri, 15 Apr 2016 23:22:19 GMT', 'server' => 'Apache', 'x-robots-tag' => 'noindex', 'x-content-type-options' => 'nosniff', 'expires' => 'Wed, 11 Jan 1984 05:00:00 GMT', 'cache-control' => 'no-cache, must-revalidate, max-age=0', 'pragma' => 'no-cache', 'x-frame-options' => 'SAMEORIGIN', 'vary' => 'Accept-Encoding', 'connection' => 'close', 'content-type' => 'text/html; charset=UTF-8', ), 'body' => 'WFSCANTESTOK', 'response' => array ( 'code' => 200, 'message' => 'OK', ), 'cookies' => array ( ), 'filename' => NULL, )
[Apr 15 16:22:19:1460762539.061373:4:info] getMaxExecutionTime() retuing default of: 15
[Apr 15 16:22:19:1460762539.059622:4:info] Got max_execution_time value from ini: 0
[Apr 15 16:22:19:1460762539.058991:4:info] Got value from wf config maxExecutionTime:
[Apr 15 16:22:19:1460762539.057840:4:info] Calling startScan(true)
[Apr 15 16:22:18:1460762538.628243:4:info] Entered fork()
[Apr 15 16:22:18:1460762538.627598:4:info] Calling fork() from wordfenceHash::processFile with maxExecTime: 15
[Apr 15 16:22:18:1460762538.620967:4:info] Scanning: /home/content/33/7646133/html/wp-content/plugins/jetpack/_inc/twitter-timeline.js (Mem:41.8M)
[Apr 15 16:22:18:1460762538.614263:4:info] Scanning: /home/content/33/7646133/html/wp-content/plugins/jetpack/_inc/spin.js (Mem:41.8M)
[Apr 15 16:22:18:1460762538.581922:4:info] Scanning: /home/content/33/7646133/html/wp-content/plugins/jetpack/_inc/postmessage.js (Mem:41.8M)
[Apr 15 16:22:18:1460762538.570154:4:info] Scanning: /home/content/33/7646133/html/wp-content/plugins/jetpack/_inc/lib/tracks/tracks-ajax.js (Mem:41.8M)
[Apr 15 16:22:18:1460762538.560823:4:info] Scanning: /home/content/33/7646133/html/wp-content/plugins/jetpack/_inc/lib/tracks/client.php (Mem:41.8M)

https://wordpress.org/plugins/wordfence/