Clone the input parameter before modifying it

lib/associations/has-one.js

@@ -57,6 +57,8 @@ module.exports = (function() {
       , smart
 
     obj[this.accessors.get] = function(params) {
+      params = Utils._.clone(params)
+
       var primaryKeys = Object.keys(this.daoFactory.primaryKeys)
         , primaryKey = primaryKeys.length === 1 ? primaryKeys[0] : 'id'
         , where = {}