diff --git a/app/assets/javascripts/discourse/app/services/header.js b/app/assets/javascripts/discourse/app/services/header.js
index 35689aa0887..42276d8b0ec 100644
--- a/app/assets/javascripts/discourse/app/services/header.js
+++ b/app/assets/javascripts/discourse/app/services/header.js
@@ -4,6 +4,8 @@ import Service, { service } from "@ember/service";
 import { TrackedMap } from "@ember-compat/tracked-built-ins";
 import { disableImplicitInjections } from "discourse/lib/implicit-injections";
 
+const VALID_HEADER_BUTTONS_TO_HIDE = ["search", "login", "signup"];
+
 @disableImplicitInjections
 export default class Header extends Service {
   @service siteSettings;
@@ -35,7 +37,26 @@ export default class Header extends Service {
   }
 
   registerHider(ref, buttons) {
-    this.#hiders.set(ref, buttons);
+    const validButtons = buttons
+      .map((button) => {
+        if (!VALID_HEADER_BUTTONS_TO_HIDE.includes(button)) {
+          // eslint-disable-next-line no-console
+          console.error(
+            `Invalid button to hide: ${button}, valid buttons are: ${VALID_HEADER_BUTTONS_TO_HIDE.join(
+              ","
+            )}`
+          );
+        } else {
+          return button;
+        }
+      })
+      .filter(Boolean);
+
+    if (!validButtons.length) {
+      return;
+    }
+
+    this.#hiders.set(ref, validButtons);
 
     registerDestructor(ref, () => {
       this.#hiders.delete(ref);
diff --git a/app/assets/javascripts/discourse/tests/unit/services/header-test.js b/app/assets/javascripts/discourse/tests/unit/services/header-test.js
new file mode 100644
index 00000000000..30ea6cceed1
--- /dev/null
+++ b/app/assets/javascripts/discourse/tests/unit/services/header-test.js
@@ -0,0 +1,22 @@
+import { getOwner } from "@ember/application";
+import { setupTest } from "ember-qunit";
+import { module, test } from "qunit";
+
+module("Unit | Service | header", function (hooks) {
+  setupTest(hooks);
+
+  hooks.beforeEach(function () {
+    this.header = getOwner(this).lookup("service:header");
+  });
+
+  test("it registers hiders", function (assert) {
+    this.header.registerHider(this, ["search", "login"]);
+    assert.ok(this.header.headerButtonsHidden.includes("search"));
+    assert.ok(this.header.headerButtonsHidden.includes("login"));
+  });
+
+  test("it does not register invalid buttons for hiders", function (assert) {
+    this.header.registerHider(this, ["search", "blahblah"]);
+    assert.notOk(this.header.headerButtonsHidden.includes("blah"));
+  });
+});