Fixes null pointer exception

CHANGELOG.md

@@ -11,6 +11,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Changed
 
+- Fixes NullPointerException in GraphErrorResponse#copy
+
 ## [2.0.16] - 2023-01-30
 
 ### Changed

src/main/java/com/microsoft/graph/http/GraphErrorResponse.java

@@ -80,8 +80,8 @@ public final AdditionalDataManager additionalDataManager() {
     public GraphErrorResponse copy() {
         GraphErrorResponse responseCopy = new GraphErrorResponse();
         responseCopy.additionalDataManager = this.additionalDataManager;
-        responseCopy.rawObject = this.rawObject.deepCopy();
-        responseCopy.error = this.error.copy();
+        responseCopy.rawObject = this.rawObject == null ? null : this.rawObject.deepCopy();
+        responseCopy.error = this.error == null ? null : this.error.copy();
         return responseCopy;
     }
 }

src/test/java/com/microsoft/graph/http/GraphErrorResponseTests.java

@@ -2,6 +2,7 @@
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.junit.jupiter.api.Assertions.assertNull;
 import static org.mockito.Mockito.mock;
 
 import org.junit.jupiter.api.Test;
@@ -59,4 +60,18 @@ public void testGraphErrorResponseCopy() {
 
         assertEquals(errorResponse.rawObject, errorResponseCopy.rawObject);
     }
+
+    @Test
+    void testGraphErrorResponseCopy2() {
+        GraphErrorResponse errorResponse = new GraphErrorResponse();;
+
+        //Copy the errorResponse and its subsequent innerErrors
+        GraphErrorResponse errorResponseCopy = errorResponse.copy();
+
+        //Ensure default null values are copied without issue.
+        assertNull(errorResponseCopy.error);
+        assertNull(errorResponseCopy.rawObject);
+
+        assertEquals(errorResponse.rawObject, errorResponseCopy.rawObject);
+    }
 }