From e4eada63e4e38be8b50167a5cef9193995ba6e61 Mon Sep 17 00:00:00 2001
From: Oleg Kalnichevski <olegk@apache.org>
Date: Sun, 13 Aug 2023 13:31:10 +0200
Subject: [PATCH] Fixed potential NPE in DigestScheme

---
 .../org/apache/hc/client5/http/impl/auth/DigestScheme.java    | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/httpclient5/src/main/java/org/apache/hc/client5/http/impl/auth/DigestScheme.java b/httpclient5/src/main/java/org/apache/hc/client5/http/impl/auth/DigestScheme.java
index 62a21002b..e068999d9 100644
--- a/httpclient5/src/main/java/org/apache/hc/client5/http/impl/auth/DigestScheme.java
+++ b/httpclient5/src/main/java/org/apache/hc/client5/http/impl/auth/DigestScheme.java
@@ -238,7 +238,9 @@ public class DigestScheme implements AuthScheme, Serializable {
     }
 
     private String createDigestResponse(final HttpRequest request) throws AuthenticationException {
-
+        if (credentials == null) {
+            throw new AuthenticationException("User credentials have not been provided");
+        }
         final String uri = request.getRequestUri();
         final String method = request.getMethod();
         final String realm = this.paramMap.get("realm");