diff --git a/back/methods/chat/sendCheckingPresence.js b/back/methods/chat/sendCheckingPresence.js
index b2a3ca725f..f67fb69424 100644
--- a/back/methods/chat/sendCheckingPresence.js
+++ b/back/methods/chat/sendCheckingPresence.js
@@ -26,6 +26,10 @@ module.exports = Self => {
     Self.sendCheckingPresence = async(ctx, workerId, message) => {
         const models = Self.app.models;
         const account = await models.Account.findById(workerId);
+        const userId = ctx.req.accessToken.userId;
+
+        if (!account)
+            throw new Error(`Could not send message "${message}" to worker id ${workerId} from user ${userId}`);
 
         const query = `SELECT worker_isWorking(?) isWorking`;
         const [result] = await Self.rawSql(query, [workerId]);
@@ -37,7 +41,7 @@ module.exports = Self => {
                 }
             });
             const department = workerDepartment && workerDepartment.department();
-            const channelName = department.chatName;
+            const channelName = department && department.chatName;
 
             if (channelName)
                 return Self.send(ctx, `#${channelName}`, `@${account.name} => ${message}`);
diff --git a/modules/worker/back/models/calendar-holidays-type.json b/modules/worker/back/models/calendar-holidays-type.json
index a83dbc13cf..178331b877 100644
--- a/modules/worker/back/models/calendar-holidays-type.json
+++ b/modules/worker/back/models/calendar-holidays-type.json
@@ -14,7 +14,7 @@
 		"name": {
 			"type": "String"
 		},
-		"rgb": {
+		"hexColour": {
 			"type": "String"
 		}
 	},
diff --git a/modules/worker/back/models/worker-dms.json b/modules/worker/back/models/worker-dms.json
index 56cad65a64..f8ad824bc4 100644
--- a/modules/worker/back/models/worker-dms.json
+++ b/modules/worker/back/models/worker-dms.json
@@ -13,10 +13,10 @@
     },
     "properties": {
         "id": {
-            "type": "Number",
-            "id": true
+            "type": "Number"
         },
         "dmsFk": {
+            "id": true,
             "type": "Number",
             "required": true,
             "mysql": {