diff --git a/src/index.js b/src/index.js
index 6a303bb..832d4d4 100644
--- a/src/index.js
+++ b/src/index.js
@@ -27,7 +27,9 @@ const createRecord = (baseName, record) => {
 }
 
 const toParam = obj =>
-  '?' + Object.keys(obj).filter(key => key).map(key => (
+  '?' + Object.keys(obj)
+    .filter(key => key && key != 'null')
+    .map(key => (
     `${key}=${obj[key]}`
   )).join('&')