--- class/piCal.php
+++ class/piCal.php
@@ -2257,7 +2257,7 @@
// カテゴリーの処理
$_POST[ 'categories' ] = '' ;
- $cids = is_object( @$_POST['cids'] ) ? $_POST['cids'] : array() ;
+ $cids = is_array( @$_POST['cids'] ) ? $_POST['cids'] : array() ;
foreach( $cids as $cid ) {
$cid = intval( $cid ) ;
while( isset( $this->categories[ $cid ] ) ) {