diff --git a/repro.mjs b/repro.mjs
new file mode 100644
index 00000000..7a23d05f
--- /dev/null
+++ b/repro.mjs
@@ -0,0 +1,19 @@
+class Helper {
+  constructor() {
+    this.prop = null;
+  }
+}
+
+class Controller {
+  constructor() {
+    this.helper = new Helper();
+  }
+  get prop() { return this.helper.prop; }
+}
+
+const c = new Controller();
+try {
+  c.prop.value = 'test';
+} catch (e) {
+  console.log('Error:', e.message);
+}
diff --git a/repro_undefined.mjs b/repro_undefined.mjs
new file mode 100644
index 00000000..bd807fd1
--- /dev/null
+++ b/repro_undefined.mjs
@@ -0,0 +1,19 @@
+class Helper {
+  constructor() {
+    // prop not defined
+  }
+}
+
+class Controller {
+  constructor() {
+    this.helper = new Helper();
+  }
+  get prop() { return this.helper.prop; }
+}
+
+const c = new Controller();
+try {
+  c.prop.value = 'test';
+} catch (e) {
+  console.log('Error:', e.message);
+}