diff --git a/frappe/website/doctype/website_theme/website_theme.js b/frappe/website/doctype/website_theme/website_theme.js
index 04828ce1d5..79e20b7c3b 100644
--- a/frappe/website/doctype/website_theme/website_theme.js
+++ b/frappe/website/doctype/website_theme/website_theme.js
@@ -74,7 +74,7 @@ frappe.ui.form.on("Website Theme", {
 								.get_field("apps")
 								.get_unchecked_options()
 								.map(app => ({ app: app }));
-							frm.set_value("ignored_apps", value);
+							frm.set_value("ignored_apps", value.length ? value : null);
 						},
 						options: apps.map(app => ({
 							label: app.title,