diff --git a/lib/customers.js b/lib/customers.js
index 5b7719af..6db8a819 100644
--- a/lib/customers.js
+++ b/lib/customers.js
@@ -5,7 +5,6 @@ const _ = require('lodash/fp')
 const db = require('./db')
 const BN = require('./bn')
 const anonymous = require('../lib/constants').anonymousCustomer
-const camelize = _.mapKeys(_.camelCase)
 const complianceOverrides = require('./compliance_overrides')
 const users = require('./users')
 
@@ -112,6 +111,20 @@ function getDailyVolume (id) {
   })
 }
 
+/**
+ * Camelize customer fields
+ * Note: return null if customer is undefined
+ *
+ * @name camelize
+ * @function
+ *
+ * @param {object} customer Customer with snake_case fields
+ * @returns {object} Camelized Customer object
+ */
+function camelize (customer) {
+  return customer ? _.mapKeys(_.camelCase, customer) : null
+}
+
 /**
  * Populate customer object
  * with dailyVolume information