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@@ -315,7 +315,7 @@ class Body {
                 $filename = mb_decode_mimeheader($filename[1]);
             }
             // 附件
-            if($data['type']=='text/plain' && stripos($item,'Content-Disposition: attachment;')!==false){
+            if(($data['type']??'')=='text/plain' && stripos($item,'Content-Disposition: attachment;')!==false){
                 $isfileattachment = 1;
                 $data['append_html'] = 1;
             }