CGLib IntelliJ NonNull issue

MyObjectTest.java

import net.sf.cglib.proxy.Enhancer;
import net.sf.cglib.proxy.NoOp;

import org.jetbrains.annotations.NotNull;
import org.junit.Test;

public class MyObjectTest {
	@Test
	public void shouldVerifyHashCodeEquals() {
		Enhancer e = new Enhancer();
		e.setSuperclass(MyObject.class);
		e.setCallbackType(NoOp.class);
		e.createClass();
	}

	public static class MyObject {
		@Override
		@NotNull
		public MyObject clone() {
			return null;
		}
	}
}

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>

	<groupId>com.example</groupId>
	<artifactId>cglib-intellij-problem</artifactId>
	<version>1.0-SNAPSHOT</version>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<java.version>1.8</java.version>
	</properties>

	<build>
		<plugins>
			<plugin>
				<groupId>com.torstling.intellij</groupId>
				<artifactId>notnull-instrumenter-maven-plugin</artifactId>
				<version>0.1.0</version>
				<executions>
					<execution>
						<goals>
							<goal>instrument</goal>
							<goal>tests-instrument</goal>
						</goals>
					</execution>
				</executions>
			</plugin>
		</plugins>
	</build>

	<dependencies>
		<dependency>
			<groupId>com.intellij</groupId>
			<artifactId>annotations</artifactId>
			<version>12.0</version>
		</dependency>
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>4.12</version>
		</dependency>
		<dependency>
			<groupId>cglib</groupId>
			<artifactId>cglib</artifactId>
			<version>3.1</version>
		</dependency>
	</dependencies>

</project>