Add null guards for getBeanDefinition() in BeanTypeRegistry

Closes gh-13818

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/condition/BeanTypeRegistry.java

@@ -159,7 +159,10 @@ final class BeanTypeRegistry implements SmartInitializingSingleton {
 	}
 
 	private void addBeanTypeForNonAliasDefinition(String name) {
-		addBeanTypeForNonAliasDefinition(name, getBeanDefinition(name));
+		RootBeanDefinition beanDefinition = getBeanDefinition(name);
+		if (beanDefinition != null) {
+			addBeanTypeForNonAliasDefinition(name, beanDefinition);
+		}
 	}
 
 	private RootBeanDefinition getBeanDefinition(String name) {
@@ -219,8 +222,9 @@ final class BeanTypeRegistry implements SmartInitializingSingleton {
 				if (!this.beanFactory.isAlias(name)
 						&& !this.beanFactory.containsSingleton(name)) {
 					RootBeanDefinition beanDefinition = getBeanDefinition(name);
-					RootBeanDefinition existingDefinition = this.beanDefinitions.put(name,
-							beanDefinition);
+					if (beanDefinition != null) {
+						RootBeanDefinition existingDefinition = this.beanDefinitions
+								.put(name, beanDefinition);
 						if (existingDefinition != null
 								&& !beanDefinition.equals(existingDefinition)) {
 							addBeanTypeForNonAliasDefinition(name, beanDefinition);
@@ -229,6 +233,7 @@ final class BeanTypeRegistry implements SmartInitializingSingleton {
 				}
 			}
 		}
+	}
 
 	/**
 	 * Attempt to guess the type that a {@link FactoryBean} will return based on the