filter out non-string display names

src/models/user.js

@@ -129,7 +129,11 @@ User.prototype.setPresenceEvent = function(event) {
  */
 User.prototype.setDisplayName = function(name) {
     const oldName = this.displayName;
+    if (typeof name === "string") {
         this.displayName = name;
+    } else {
+        this.displayName = undefined;
+    }
     if (name !== oldName) {
         this._updateModifiedTime();
     }
@@ -142,7 +146,11 @@ User.prototype.setDisplayName = function(name) {
  * @param {string} name The new display name.
  */
 User.prototype.setRawDisplayName = function(name) {
+    if (typeof name === "string") {
         this.rawDisplayName = name;
+    } else {
+        this.rawDisplayName = undefined;
+    }
 };
 
 

src/utils.ts

@@ -661,7 +661,9 @@ export function isNumber(value: any): boolean {
  * @return {string} a string with the hidden characters removed
  */
 export function removeHiddenChars(str: string): string {
+    if (typeof str === "string") {
         return unhomoglyph(str.normalize('NFD').replace(removeHiddenCharsRegex, ''));
+    }
 }
 
 // Regex matching bunch of unicode control characters and otherwise misleading/invisible characters.