diff --git a/curriculum/challenges/english/blocks/lab-cargo-manifest-validator/69a56b5069ca99f7317e6e19.md b/curriculum/challenges/english/blocks/lab-cargo-manifest-validator/69a56b5069ca99f7317e6e19.md
index 7ed0a6f8a7e..6ca69f85f64 100644
--- a/curriculum/challenges/english/blocks/lab-cargo-manifest-validator/69a56b5069ca99f7317e6e19.md
+++ b/curriculum/challenges/english/blocks/lab-cargo-manifest-validator/69a56b5069ca99f7317e6e19.md
@@ -262,6 +262,7 @@ Calling `validateManifest()` with `{}` should return the new object `{ container
 
 ```js
 const testObj = {
+
 };
 
 const expected = {
@@ -279,6 +280,27 @@ assert.notStrictEqual(copy, testObj, "validateManifest() should return a new obj
 assert.equal(Object.keys(testObj).length, 0, "validateManifest() should return a new object, not mutate the original")
 ```
 
+Calling `validateManifest()` with `{ containerId: null, destination: "Santa Cruz", weight: 304, unit: "kg", hazmat: false }` should return the new object `{ containerId: "Invalid" }` without mutating the source input.
+
+```js
+const testObj = {
+  containerId: null,
+  destination: "Santa Cruz",
+  weight: 304,
+  unit: "kg",
+  hazmat: false
+};
+
+const expected = {
+  containerId: "Invalid"
+};
+
+const copy = validateManifest(testObj);
+assert.isObject(copy);
+assert.deepEqual(copy, expected, "validateManifest() did not return the expected object for null containerId");
+assert.notStrictEqual(copy, testObj, "validateManifest() should return a new object, not mutate the original");
+```
+
 Calling `validateManifest()` with `{ containerId: 0, destination: 405, weight: -84, unit: "pounds", hazmat: "no" }` should return the new object `{ containerId: "Invalid", destination: "Invalid", weight: "Invalid", unit: "Invalid", hazmat: "Invalid" }` without mutating the source input.
 
 ```js