diff --git a/back/methods/chat/notifyIssues.js b/back/methods/chat/notifyIssues.js
index 3c4706d076..f618a6fb16 100644
--- a/back/methods/chat/notifyIssues.js
+++ b/back/methods/chat/notifyIssues.js
@@ -32,7 +32,7 @@ module.exports = Self => {
         let message = $t(`There's a new urgent ticket:`);
         const ostUri = 'https://cau.verdnatura.es/scp/tickets.php?id=';
         tickets.forEach(ticket => {
-            message += `\r\n[ID: *${ticket.number}* - ${ticket.subject} @${ticket.username}](${ostUri + ticket.id})`;
+            message += `\r\n[ID: ${ticket.number} - ${ticket.subject} @${ticket.username}](${ostUri + ticket.id})`;
         });
 
         const department = await models.Department.findOne({
diff --git a/back/models/chat.js b/back/models/chat.js
index f45d151806..a18edbd3fb 100644
--- a/back/models/chat.js
+++ b/back/models/chat.js
@@ -11,9 +11,11 @@ module.exports = Self => {
         let {message} = ctx.instance;
         if (!message) return;
 
-        const parts = message.match(/(?<=\[).*(?=])/g);
+        const parts = message.match(/(?<=\[)[a-zA-Z0-9_\-+!@#$%^&*()={};':"\\|,.<>/?\s]*(?=])/g);
+        if (!parts) return;
+
         const replacedParts = parts.map(part => {
-            return part.replace(/[*()]/g, '');
+            return part.replace(/[!$%^&*()={};':"\\,.<>/?]/g, '');
         });
 
         for (const [index, part] of parts.entries())