diff --git a/app/Console/Commands/UpdateLetter.php b/app/Console/Commands/UpdateLetter.php
index 894b82f..282312e 100755
--- a/app/Console/Commands/UpdateLetter.php
+++ b/app/Console/Commands/UpdateLetter.php
@@ -45,7 +45,11 @@ class UpdateLetter extends Command
         // 更新用户首字母
         $users = User::whereNull('letter')->whereNotNull('name')->limit(100)->get();
         foreach ($users as $user) {
-            $user->letter = strtoupper(Pinyin::abbr(mb_substr($user->name, 0, 1))[0]);
+            $name = $user->username;
+            if ($user->name) {
+                $name = $user->name;
+            }
+            $user->letter = strtoupper(Pinyin::abbr(mb_substr($name, 0, 1))[0]);
             $user->save();
         }
         return self::SUCCESS;