diff --git a/src/mami.js/ui/messages.jsx b/src/mami.js/ui/messages.jsx
index d4df9fc..7eec208 100644
--- a/src/mami.js/ui/messages.jsx
+++ b/src/mami.js/ui/messages.jsx
@@ -191,7 +191,6 @@ Umi.UI.Messages = (function() {
                     bType = msg.type.substring(7);
                     bIsError = msg.detail.error;
                     bArgs = msg.detail.args;
-                    msgAuthor = Umi.Users.FindExact(bArgs[0]) ?? Umi.Users.FindExact('~' + bArgs[0]);
                 }
 
                 soundName = bIsError ? 'error' : 'server';
diff --git a/src/mami.js/users.js b/src/mami.js/users.js
index 4ba7651..703515e 100644
--- a/src/mami.js/users.js
+++ b/src/mami.js/users.js
@@ -182,6 +182,9 @@ Umi.Users = (function() {
             return found;
         },
         FindExact: function(userName) {
+            if(typeof userName !== 'string')
+                return null;
+
             userName = userName.toLowerCase();
 
             for(const user of users.values())