From 0645099e027cd0e31a828572169a8c25474e2b5c Mon Sep 17 00:00:00 2001
From: Timmy Willison <4timmywil@gmail.com>
Date: Wed, 20 Jun 2018 12:07:44 -0400
Subject: Serialize: jQuery.param: return empty string when given
 null/undefined

Fixes gh-2633
Close gh-4108
---
 src/serialize.js | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'src')

diff --git a/src/serialize.js b/src/serialize.js
index 30fcf98cc..44d3606b3 100644
--- a/src/serialize.js
+++ b/src/serialize.js
@@ -70,6 +70,10 @@ jQuery.param = function( a, traditional ) {
 				encodeURIComponent( value == null ? "" : value );
 		};
 
+	if ( a == null ) {
+		return "";
+	}
+
 	// If an array was passed in, assume that it is an array of form elements.
 	if ( Array.isArray( a ) || ( a.jquery && !jQuery.isPlainObject( a ) ) ) {
 
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