From 601954eacea9f222f67f704ae64cbcbd053cfa55 Mon Sep 17 00:00:00 2001
From: "a.novikov2" <a.novikov2@tinkoff.ru>
Date: Thu, 7 Feb 2019 12:09:06 +0300
Subject: [PATCH] The keys for the formData parameter must not be null

---
 .../springframework/http/converter/FormHttpMessageConverter.java | 1 +
 1 file changed, 1 insertion(+)

diff --git a/spring-web/src/main/java/org/springframework/http/converter/FormHttpMessageConverter.java b/spring-web/src/main/java/org/springframework/http/converter/FormHttpMessageConverter.java
index ab2d70d34bf3..088fe8362475 100644
--- a/spring-web/src/main/java/org/springframework/http/converter/FormHttpMessageConverter.java
+++ b/spring-web/src/main/java/org/springframework/http/converter/FormHttpMessageConverter.java
@@ -334,6 +334,7 @@ protected String serializeForm(MultiValueMap<String, Object> formData, Charset c
 						if (builder.length() != 0) {
 							builder.append('&');
 						}
+						Assert.notNull(name, "Name must not be null");
 						builder.append(URLEncoder.encode(name, charset.name()));
 						if (value != null) {
 							builder.append('=');