diff --git a/src/test/java/es/uvigo/esei/daa/rest/PeopleResourceUnitTest.java b/src/test/java/es/uvigo/esei/daa/rest/PeopleResourceUnitTest.java
index 1e7d8af382dfec17a8786063c236351c70673546..5cb75654a8eca50305099a1cf3959f052e8f1e38 100644
--- a/src/test/java/es/uvigo/esei/daa/rest/PeopleResourceUnitTest.java
+++ b/src/test/java/es/uvigo/esei/daa/rest/PeopleResourceUnitTest.java
@@ -193,6 +193,18 @@ public class PeopleResourceUnitTest {
 		assertThat(response, hasBadRequestStatus());
 	}
 
+	@Test
+	public void testModifyNullPointerException() throws Exception {
+		daoMock.modify(anyObject());
+		expectLastCall().andThrow(new NullPointerException());
+		
+		replay(daoMock);
+
+		final Response response = resource.modify(existentId(), newName(), newSurname());
+		
+		assertThat(response, hasBadRequestStatus());
+	}
+
 	@Test
 	public void testAdd() throws Exception {
 		expect(daoMock.add(newName(), newSurname()))