diff --git a/app/ticket/service/ConversationService.php b/app/ticket/service/ConversationService.php
index 7682079..8e5e49e 100644
--- a/app/ticket/service/ConversationService.php
+++ b/app/ticket/service/ConversationService.php
@@ -23,7 +23,7 @@ class ConversationService
         $ossservice = new OssService();
         foreach ($result as $key => $value) {
             $result[$key]['content'] = str_replace($status_fanyi,$ticket_status,$value['content']);
-            $result[$key]['attachment'] = unserialize($value['attachment']);
+            $result[$key]['attachment'] = empty($value['attachment'])?[]:unserialize($value['attachment']);
             foreach ($result[$key]['attachment'] as $k => $attachment) {
                 $result[$key]['attachment_full'][$k] = (!empty($attachment))?$ossservice->generatePrivateUrl($attachment):'';
             }