diff --git a/back/models/chat.js b/back/models/chat.js
index 5eb986a2c..b75900ebd 100644
--- a/back/models/chat.js
+++ b/back/models/chat.js
@@ -12,6 +12,8 @@ module.exports = Self => {
         if (!message) return;
 
         const parts = message.match(/(?<=\[)[a-zA-Z0-9!@#$%^&*()={};':"\\|,.<>/?\s]*(?=])/g);
+        if (!parts) return;
+
         const replacedParts = parts.map(part => {
             return part.replace(/[!@#$%^&*()={};':"\\|,.<>/?]/g, '');
         });