diff --git a/e2e/playwright/editor-tests.spec.ts b/e2e/playwright/editor-tests.spec.ts
index 05beac687..5713e74aa 100644
--- a/e2e/playwright/editor-tests.spec.ts
+++ b/e2e/playwright/editor-tests.spec.ts
@@ -694,6 +694,9 @@ test.describe('Editor tests', () => {
         .toHaveText(`sketch001 = startSketchOn('XZ')
     |> startProfileAt([3.14, 12], %)
     |> xLine(5, %) // lin`)
+
+      // expect there to be no KCL errors
+      await expect(page.locator('.cm-lint-marker-error')).toHaveCount(0)
     })
 
     test('with tab to accept the completion', async ({ page }) => {
diff --git a/src/editor/manager.ts b/src/editor/manager.ts
index 6bedf03d2..d0f6e02bd 100644
--- a/src/editor/manager.ts
+++ b/src/editor/manager.ts
@@ -72,9 +72,10 @@ export default class EditorManager {
       // we cannot use <>.constructor.name since it will get destroyed
       // when packaging the application.
       const isTreeHighlightPlugin =
-        e.value.hasOwnProperty('tree') &&
-        e.value.hasOwnProperty('decoratedTo') &&
-        e.value.hasOwnProperty('decorations')
+        e?.value &&
+        e.value?.hasOwnProperty('tree') &&
+        e.value?.hasOwnProperty('decoratedTo') &&
+        e.value?.hasOwnProperty('decorations')
 
       if (isTreeHighlightPlugin) {
         let originalUpdate = e.value.update