bug

@@ -27,14 +27,16 @@ class Home extends Base {
     private function getFolderIds($email_id){
         $folder_ids   =   app()->request('folder_ids',[],['intval','abs']);
 
-        foreach ($folder_ids as $k=>$folder_id){
-            if(!$folder_id){
-                unset($folder_ids[$k]);
+        if(is_array($folder_ids)){
+            foreach ($folder_ids as $k=>$folder_id){
+                if(!$folder_id){
+                    unset($folder_ids[$k]);
+                }
             }
-        }
 
-        if($folder_ids){
-            $folder_ids = array_values($folder_ids);
+            if($folder_ids){
+                $folder_ids = array_values($folder_ids);
+            }
         }
 
         // 默认查询 inbox