Salesforce Encrypted Keys: Undefined variable

Installed the Keys and Encrypt modules at the latest level.

Enabled Salesforce Encrypted Keys module and received the following:

Notice: Undefined variable: requirements in salesforce_encrypt_requirements() (line 40 of modules/salesforce/modules/salesforce_encrypt/salesforce_encrypt.install).
salesforce_encrypt_requirements('install')
call_user_func_array('salesforce_encrypt_requirements', Array) (Line: 391)
Drupal\Core\Extension\ModuleHandler->invoke('salesforce_encrypt', 'requirements', Array) (Line: 1007)
drupal_check_module('salesforce_encrypt') (Line: 412)