Whoops\Exception\ErrorException Illegal string offset 'disable_epm'

Whoops\Exception\ErrorException thrown with message "Illegal string offset 'disable_epm'"

Stacktrace:
#8 Whoops\Exception\ErrorException in /var/www/html/admin/modules/endpointman/lib/Config.class.php:50
#7 Whoops\Run:handleError in /var/www/html/admin/modules/endpointman/lib/Config.class.php:50
#6 FreePBX\modules\Endpointman\Config:set in /var/www/html/admin/modules/endpointman/Endpointman.class.php:86
#5 FreePBX\modules\Endpointman:__construct in /var/www/html/admin/libraries/BMO/Self_Helper.class.php:124
#4 FreePBX\Self_Helper:autoLoad in /var/www/html/admin/libraries/BMO/Self_Helper.class.php:63
#3 FreePBX\Self_Helper:injectClass in /var/www/html/admin/libraries/modulefunctions.class.php:2560
#2 module_functions:_runscripts in /var/www/html/admin/libraries/modulefunctions.class.php:2034
#1 module_functions:install in /var/www/html/admin/page.modules.php:288
#0 include in /var/www/html/admin/config.php:476