Fix bug

src/models/user.ts

@@ -100,7 +100,7 @@ export function validatePassword(password: string): boolean {
 }
 
 export function isValidName(name: string): boolean {
-	return typeof name == 'string' && name.length < 30 && name.trim() != '';
+	return name === null || (typeof name == 'string' && name.length < 30 && name.trim() != '');
 }
 
 export function isValidDescription(description: string): boolean {