fix bug

@@ -11,7 +11,7 @@ const url = require('url');
  *  @return referer
  */
 exports.refererLimit = (referer, blacklist) => {  // eslint-disable-line
-    let result = decodeURI(referer | '/home');
+    let result = decodeURIComponent(referer || '/home');
 
     let urlObj = url.parse(referer, false, true);