From a2e73ce0b45e108dd76e920705acd25aafce5b75 Mon Sep 17 00:00:00 2001
From: Marcin Grzejszczak <marcin.grzejszczak@gmail.com>
Date: Fri, 10 Jan 2020 00:13:13 +0100
Subject: [PATCH] Added a NPE guard

---
 .../cloud/sleuth/instrument/web/TraceWebFilter.java            | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/spring-cloud-sleuth-core/src/main/java/org/springframework/cloud/sleuth/instrument/web/TraceWebFilter.java b/spring-cloud-sleuth-core/src/main/java/org/springframework/cloud/sleuth/instrument/web/TraceWebFilter.java
index 8b4d5b6f9..78d2cfc08 100644
--- a/spring-cloud-sleuth-core/src/main/java/org/springframework/cloud/sleuth/instrument/web/TraceWebFilter.java
+++ b/spring-cloud-sleuth-core/src/main/java/org/springframework/cloud/sleuth/instrument/web/TraceWebFilter.java
@@ -308,6 +308,9 @@ public final class TraceWebFilter implements WebFilter, Ordered {
 			}
 
 			private void addClassNameTag(Object handler, Span span) {
+				if (handler == null) {
+					return;
+				}
 				String className;
 				if (handler instanceof HandlerMethod) {
 					className = ((HandlerMethod) handler).getBeanType().getSimpleName();