diff --git a/pmcalendar.php b/pmcalendar.php
index 826da47..3f8fd0c 100644
--- a/pmcalendar.php
+++ b/pmcalendar.php
@@ -205,9 +205,8 @@ if ($act == 'newevent') {
     $del = r('del');
     $content = stripslashes(r('content'));
     $dict = array();
-    $event = DB::getone("select yanqi_history from calendar where id='{$id}'");
+    $event = DB::getone("select yanqi_history from calendar where id={$id}");
     $yanqi_history = $event['yanqi_history'];
-    $yanqi_history=json_decode($yanqi_history,true);
     if(!$del) {
         $yanqi_history[$idx]['reason'] = $content;
     }