diff --git a/src/Umbraco.Web.UI.Client/src/libs/extension-api/controller/base-extensions-controller.ts b/src/Umbraco.Web.UI.Client/src/libs/extension-api/controller/base-extensions-controller.ts
index b847bb1228..b302ad1830 100644
--- a/src/Umbraco.Web.UI.Client/src/libs/extension-api/controller/base-extensions-controller.ts
+++ b/src/Umbraco.Web.UI.Client/src/libs/extension-api/controller/base-extensions-controller.ts
@@ -99,8 +99,8 @@ export abstract class UmbBaseExtensionsController<
 			this._permittedExts.forEach((extCtrl) => {
 				// Check if it overwrites another extension:
 				// if so, look up the extension it overwrites, and remove it from the list. and check that for if it overwrites another extension and so on.
-				if (extCtrl.overwrites.length > 0) {
-					extCtrl.overwrites.forEach((overwrite) => {
+				if (extCtrl.overwrites && extCtrl.overwrites.length > 0) {
+					extCtrl.overwrites?.forEach((overwrite) => {
 						this.#removeOverwrittenExtensions(exposedPermittedExts, overwrite);
 					});
 				}