[Defender] PHP Fatal Error - Hammer

I just caught this in my error log:

[04-Jan-2019 21:11:25 UTC] PHP Fatal error:  Uncaught Error: Cannot unset string offsets in /wp-content/plugins/wp-defender/app/module/scan/behavior/pro/content-scan.php:86
Stack trace:
#0 /wp-content/plugins/wp-defender/app/module/scan/behavior/pro/content-scan.php(47): WP_Defender\Module\Scan\Behavior\Pro\Content_Scan->scanAFile('/home/hilinemer...')
#1 [internal function]: WP_Defender\Module\Scan\Behavior\Pro\Content_Scan->processItemInternal(Array, '/home/hilinemer...')
#2 /wp-content/plugins/wp-defender/vendor/hammer/base/component.php(217): ReflectionMethod->invokeArgs(Object(WP_Defender\Module\Scan\Behavior\Pro\Content_Scan), Array)
#3 /wp-content/plugins/wp-defender/vendor/hammer/queue/queue.php(184): Hammer\Base\Component->__call('processItemInte...', Array)
#4 /wp-content/plugins/wp-defender/app/module/scan/component/scan-api.php(251): Hammer\Queue\Queue->processItem()
#5 in /wp-content/plugins/wp-defender/app/module/scan/behavior/pro/content-scan.php on line 86