Index: sites/all/modules/contrib/xmlsitemap/xmlsitemap.xmlsitemap.inc
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- sites/all/modules/contrib/xmlsitemap/xmlsitemap.xmlsitemap.inc	(revision 4326)
+++ sites/all/modules/contrib/xmlsitemap/xmlsitemap.xmlsitemap.inc	(revision )
@@ -134,7 +134,12 @@
    */
   public function flush($empty = TRUE) {
     $return = parent::flush($empty);
-    $this->status &= (bool) $return;
+    if (isset($return)) {
+      $this->status = TRUE;
+    }
+    else {
+      $this->status = FALSE;
+    }
     return $return;
   }