fix

backend/controllers/CoinController.php

@@ -108,6 +108,7 @@ class CoinController extends BaseController
                     $introduce[$lang[$key]] = $val;
                 }
                 unset($data['nickname']);
+                unset($data['introduce']);
                 $data['nickname'] = $nickname;
                 $data['introduce'] = $introduce;
                 $result = $coin->addOne($data);