1 files changed, 6 insertions, 2 deletions
diff --git a/lib/src/lustre.ffi.mjs b/lib/src/lustre.ffi.mjs
index 2d07394..c7008ed 100644
--- a/lib/src/lustre.ffi.mjs
+++ b/lib/src/lustre.ffi.mjs
@@ -1,6 +1,8 @@
 import {
-  ElementNotFound,
+  AppAlreadyStarted,
+  AppNotYetStarted,
   ComponentAlreadyRegistered,
+  ElementNotFound,
   NotABrowser,
 } from "./lustre.mjs";
 import { from } from "./lustre/effect.mjs";
@@ -31,7 +33,7 @@ export class App {
 
   start(selector, flags) {
     if (!is_browser()) return new Error(new NotABrowser());
-    if (this.#root) return this;
+    if (this.#root) return new Error(new AppAlreadyStarted());
 
     const el = document.querySelector(selector);
 
@@ -65,6 +67,8 @@ export class App {
   }
 
   destroy() {
+    if (!this.#root) return new Error(new AppNotYetStarted());
+
     this.#root.remove();
     this.#state = null;
     this.#queue = [];