diff --git a/module/chat-utility.js b/module/chat-utility.js
index 8379e146..30fc0766 100644
--- a/module/chat-utility.js
+++ b/module/chat-utility.js
@@ -92,8 +92,8 @@ export class ChatUtility {
 
   /* -------------------------------------------- */
   static getWhisperRecipientsAndGMs(name) {
-    return ChatMessage.getWhisperRecipients(name)
-      .concat(ChatMessage.getWhisperRecipients('GM'));
+    let recep1 = ChatMessage.getWhisperRecipients(name) || [];
+    return recep1.concat(ChatMessage.getWhisperRecipients('GM'));
   }
 
   /* -------------------------------------------- */
diff --git a/system.json b/system.json
index dde66004..36d8c3f7 100644
--- a/system.json
+++ b/system.json
@@ -2,10 +2,10 @@
   "name": "foundryvtt-reve-de-dragon",
   "title": "Rêve de Dragon",
   "description": "Rêve de Dragon RPG for FoundryVTT",
-  "version": "1.5.3",
+  "version": "1.5.4",
   "manifestPlusVersion": "1.0.0",
   "minimumCoreVersion": "0.8.0",
-  "compatibleCoreVersion": "0.8.99",
+  "compatibleCoreVersion": "0.8.9",
   "templateVersion": 116,
   "author": "LeRatierBretonnien",
   "authors": [
@@ -330,7 +330,7 @@
   "secondaryTokenAttribute": "sante.endurance",
   "socket": true,
   "url": "https://gitlab.com/LeRatierBretonnien/foundryvtt-reve-de-dragon/",
-  "manifest": "https://gitlab.com/LeRatierBretonnien/foundryvtt-reve-de-dragon/raw/v1.4/system.json",
-  "download": "https://gitlab.com/LeRatierBretonnien/foundryvtt-reve-de-dragon/-/archive/v1.4/foundryvtt-reve-de-dragon-master.zip",
+  "manifest": "https://gitlab.com/LeRatierBretonnien/foundryvtt-reve-de-dragon/raw/v1.5/system.json",
+  "download": "https://gitlab.com/LeRatierBretonnien/foundryvtt-reve-de-dragon/-/archive/v1.5/foundryvtt-reve-de-dragon-master.zip",
   "license": "LICENSE.txt"
 }