After upgrade from 3.3.2-1 to 3.4.2-1 naginator fails to create config from exported resources taken from hiera

gtAfter upgrade from 3.3.2-1 to 3.4.2-1 naginator fails to create config from exported resources, data taken from hiera.

When hiera has the following data:
"check_apt_security" :

{ "check_command" : "check_nrpe_1arg!check_apt_security", "contact_groups" : "sladmins", "normal_check_interval" : 10, "retry_check_interval" : 30, "max_check_attempts" : 3, "notification_interval" : 1440, "notifications_enabled" : 1 }

Error: /Stage[main]/Nagios::Base/Nagios_service[xxxx]: Could not evaluate: private method `sub' called for 1:Fixnum
Which clearly indicates that variable is not a string.

When I quote integers in the hiera json file everything works fine, not sure if this is hiera or puppet naginator problem.