diff --git a/CHANGELOG.md b/CHANGELOG.md
index c36dcf5..21aa741 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,9 @@
 # Changelog
 Date format : day/month/year
 
+## 1.9.1 - ??/??/2022 - ???
+- Fix for advancements fail to add new items ("_id" readonly error. see #42).
+
 ## 1.9.0 - 01/09/2022 - Foundry v10 Compatibility
 __! Be certain to carefully back up any critical user data before installing this update !__
 - Updated the System to FoundryVTT v10.
diff --git a/README.md b/README.md
index 82cf99e..5e726a3 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,7 @@
 
 ![Banner Legend of the Five Rings](./l5rBan.jpg)
 [![Buy Me a Coffee](./tags-bymecoffee.svg)](https://ko-fi.com/vlyan)
+[![FoundryVTT version](https://img.shields.io/badge/FVTT-v10.x-informational)](https://foundryvtt.com/)
 [![Forge Installs](https://img.shields.io/badge/dynamic/json?label=Forge%20Installs&query=package.installs&suffix=%25&url=https%3A%2F%2Fforge-vtt.com%2Fapi%2Fbazaar%2Fpackage%2Fl5r5e&colorB=4aa94a)](https://forge-vtt.com/bazaar#package=l5r5e)
 [![Foundry Hub Endorsements](https://img.shields.io/endpoint?logoColor=white&url=https%3A%2F%2Fwww.foundryvtt-hub.com%2Fwp-json%2Fhubapi%2Fv1%2Fpackage%2Fl5r5e%2Fshield%2Fendorsements)](https://www.foundryvtt-hub.com/package/l5r5e/)
 [![Foundry Hub Comments](https://img.shields.io/endpoint?logoColor=white&url=https%3A%2F%2Fwww.foundryvtt-hub.com%2Fwp-json%2Fhubapi%2Fv1%2Fpackage%2Fl5r5e%2Fshield%2Fcomments)](https://www.foundryvtt-hub.com/package/l5r5e/)
diff --git a/system/scripts/item.js b/system/scripts/item.js
index 18fad37..9586700 100644
--- a/system/scripts/item.js
+++ b/system/scripts/item.js
@@ -216,8 +216,11 @@ export class ItemL5r5e extends Item {
         }
 
         // New id
-        if (newId) {
-            item._id = foundry.utils.randomID();
+        if (newId || !item._id) {
+            // Bypass the readonly for "_id"
+            const tmpData = item.toJSON();
+            tmpData._id = foundry.utils.randomID();
+            item = new ItemL5r5e(tmpData);
         }
 
         // Copy the parent permission to the sub item