Check the nullable Document::settings() before accessing.

Source/core/loader/LinkLoader.cpp

Index: Source/core/loader/LinkLoader.cpp
diff --git a/Source/core/loader/LinkLoader.cpp b/Source/core/loader/LinkLoader.cpp
index 054b982c7e637049f7476408e64f4e41ebccfb3f..1a5a0f671428bf788c04d96e15a823bf888efea3 100644
--- a/Source/core/loader/LinkLoader.cpp
+++ b/Source/core/loader/LinkLoader.cpp
@@ -132,7 +132,8 @@ static void preconnectIfNeeded(const LinkRelAttribute& relAttribute, const KURL&
 {
     if (relAttribute.isPreconnect() && href.isValid()) {
         ASSERT(RuntimeEnabledFeatures::linkPreconnectEnabled());
-        if (document.settings()->logDnsPrefetchAndPreconnect())
+        Settings* settings = document.settings();
+        if (settings && settings->logDnsPrefetchAndPreconnect())
             document.addConsoleMessage(ConsoleMessage::create(OtherMessageSource, DebugMessageLevel, String("Preconnect triggered for " + href.host())));
         preconnect(href);
     }
@@ -163,7 +164,8 @@ void LinkLoader::preloadIfNeeded(const LinkRelAttribute& relAttribute, const KUR
             return;
         }
         FetchRequest linkRequest(ResourceRequest(document.completeURL(href)), FetchInitiatorTypeNames::link);
-        if (document.settings()->logPreload())
+        Settings* settings = document.settings();
+        if (settings && settings->logPreload())
             document.addConsoleMessage(ConsoleMessage::create(OtherMessageSource, DebugMessageLevel, String("Preload triggered for " + href.host() + href.path())));
         setResource(document.fetcher()->fetchLinkPreloadResource(type, linkRequest));
     }