diff --git a/main.js b/main.js
index 5d91ad3..271e707 100644
--- a/main.js
+++ b/main.js
@@ -13,9 +13,14 @@ module.exports = class RibbonOrderLock extends Plugin {
     const ribbon = this.app.workspace.leftRibbon;
     const order = this.settings.order;
 
-    const sorted = [...ribbon.items].sort(
-      (a, b) => order.indexOf(a.id) - order.indexOf(b.id)
-    );
+    const sorted = [...ribbon.items].sort((a, b) => {
+      const ia = order.indexOf(a.id);
+      const ib = order.indexOf(b.id);
+      if (ia === -1 && ib === -1) return 0;
+      if (ia === -1) return 1;
+      if (ib === -1) return -1;
+      return ia - ib;
+    });
 
     ribbon.items.length = 0;
     ribbon.items.push(...sorted);