bug

@@ -27,6 +27,7 @@ class Home extends Base {
     private function getFolderIds($email_id){
         $folder_ids   =   app()->request('folder_ids',[],['intval','abs']);
 
+        if(is_array($folder_ids)){
             foreach ($folder_ids as $k=>$folder_id){
                 if(!$folder_id){
                     unset($folder_ids[$k]);
@@ -36,6 +37,7 @@ class Home extends Base {
             if($folder_ids){
                 $folder_ids = array_values($folder_ids);
             }
+        }
 
         // 默认查询 inbox
         if(!is_array($folder_ids) || !$folder_ids){