Corrected property access on possibly undefined variable.

Author: whitelynx

lib/client.js

@@ -32,7 +32,7 @@ var Client = function(config) {
   this.secretKey = null;
   this.ssl = this.connectionParameters.ssl || false;
 
-  this._types = config.types || types;
+  this._types = c.types || types;
   this._parserOverrides = {
     text: {},
     binary: {}