diff --git a/lib/twitter.js b/lib/twitter.js
index 1dbf3e27..909dc575 100644
--- a/lib/twitter.js
+++ b/lib/twitter.js
@@ -116,7 +116,7 @@ Twitter.prototype.__request = function(method, path, params, callback) {
   }
 
   // Set API base
-  if (typeof params.base !== 'undefined') {
+  if (params && typeof params.base !== 'undefined') {
     base = params.base;
     delete params.base;
   }