diff --git a/src/main/java/org/springframework/data/repository/aot/generate/AotRepositoryMetadata.java b/src/main/java/org/springframework/data/repository/aot/generate/AotRepositoryMetadata.java
index 315a0e0dc..04c1f9556 100644
--- a/src/main/java/org/springframework/data/repository/aot/generate/AotRepositoryMetadata.java
+++ b/src/main/java/org/springframework/data/repository/aot/generate/AotRepositoryMetadata.java
@@ -17,13 +17,15 @@ package org.springframework.data.repository.aot.generate;
 
 import java.util.List;
 
+import org.jspecify.annotations.Nullable;
+
 /**
  * Value object capturing metadata about a repository.
  *
  * @author Mark Paluch
  * @since 4.0
  */
-record AotRepositoryMetadata(String name, String module,
+record AotRepositoryMetadata(String name, @Nullable String module,
 		org.springframework.data.repository.aot.generate.AotRepositoryMetadata.RepositoryType type,
 		List<AotRepositoryMethod> methods) {
 
diff --git a/src/main/java/org/springframework/data/repository/config/RepositoryBeanDefinitionReader.java b/src/main/java/org/springframework/data/repository/config/RepositoryBeanDefinitionReader.java
index 6d064a294..0da2f66d8 100644
--- a/src/main/java/org/springframework/data/repository/config/RepositoryBeanDefinitionReader.java
+++ b/src/main/java/org/springframework/data/repository/config/RepositoryBeanDefinitionReader.java
@@ -39,6 +39,7 @@ import org.springframework.data.repository.core.support.AbstractRepositoryMetada
 import org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport;
 import org.springframework.data.repository.core.support.RepositoryFragment;
 import org.springframework.data.repository.core.support.RepositoryFragmentsContributor;
+import org.springframework.util.Assert;
 import org.springframework.util.ClassUtils;
 import org.springframework.util.ObjectUtils;
 
@@ -82,6 +83,8 @@ class RepositoryBeanDefinitionReader {
 	 */
 	public RepositoryInformation getRepositoryInformation() {
 
+		Assert.notNull(configuration, "Configuration must not be null");
+
 		RepositoryMetadata metadata = AbstractRepositoryMetadata
 				.getMetadata(forName(configuration.getRepositoryInterface()));
 		Class<?> repositoryBaseClass = getRepositoryBaseClass();
@@ -178,6 +181,8 @@ class RepositoryBeanDefinitionReader {
 			return (RepositoryFragmentsContributor) BeanUtils.instantiateClass(getClass(bd));
 		}
 
+		Assert.state(beanDefinition.getBeanClassName() != null, "No Repository BeanFactory set");
+
 		Class<?> repositoryFactoryBean = forName(beanDefinition.getBeanClassName());
 		Constructor<?> constructor = ClassUtils.getConstructorIfAvailable(repositoryFactoryBean, Class.class);
 
diff --git a/src/test/java/org/springframework/data/repository/config/DummyRegistrarWithContributor.java b/src/test/java/org/springframework/data/repository/config/DummyRegistrarWithContributor.java
index 85708eb8f..d509b4ecd 100644
--- a/src/test/java/org/springframework/data/repository/config/DummyRegistrarWithContributor.java
+++ b/src/test/java/org/springframework/data/repository/config/DummyRegistrarWithContributor.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2022-2025 the original author or authors.
+ * Copyright 2025 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.
diff --git a/src/test/java/org/springframework/data/repository/config/EnableRepositoriesWithContributor.java b/src/test/java/org/springframework/data/repository/config/EnableRepositoriesWithContributor.java
index 2c38047e0..051d18c6f 100644
--- a/src/test/java/org/springframework/data/repository/config/EnableRepositoriesWithContributor.java
+++ b/src/test/java/org/springframework/data/repository/config/EnableRepositoriesWithContributor.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2025 the original author or authors.
+ * Copyright 2025 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.