diff --git a/oauth2/oauth2-client/src/main/java/org/springframework/security/oauth2/client/web/server/WebSessionServerOAuth2AuthorizedClientRepository.java b/oauth2/oauth2-client/src/main/java/org/springframework/security/oauth2/client/web/server/WebSessionServerOAuth2AuthorizedClientRepository.java
index e3b462ebac3..b37d325ea3c 100644
--- a/oauth2/oauth2-client/src/main/java/org/springframework/security/oauth2/client/web/server/WebSessionServerOAuth2AuthorizedClientRepository.java
+++ b/oauth2/oauth2-client/src/main/java/org/springframework/security/oauth2/client/web/server/WebSessionServerOAuth2AuthorizedClientRepository.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -94,14 +94,10 @@ public Mono<Void> removeAuthorizedClient(String clientRegistrationId, Authentica
 		// @formatter:on
 	}
 
-	@SuppressWarnings("unchecked")
 	private Map<String, OAuth2AuthorizedClient> getAuthorizedClients(WebSession session) {
-		Map<String, OAuth2AuthorizedClient> authorizedClients = (session != null)
-				? (Map<String, OAuth2AuthorizedClient>) session.getAttribute(this.sessionAttributeName) : null;
-		if (authorizedClients == null) {
-			authorizedClients = new HashMap<>();
-		}
-		return authorizedClients;
+		Assert.notNull(session, "session cannot be null");
+		Map<String, OAuth2AuthorizedClient> authorizedClients = session.getAttribute(this.sessionAttributeName);
+		return (authorizedClients != null) ? authorizedClients : new HashMap<>();
 	}
 
 }