2 files changed, 11 insertions, 2 deletions
diff --git a/modules/gallery/libraries/ORM_MPTT.php b/modules/gallery/libraries/ORM_MPTT.php
index d8d88e4e..f20fafa0 100644
--- a/modules/gallery/libraries/ORM_MPTT.php
+++ b/modules/gallery/libraries/ORM_MPTT.php
@@ -96,12 +96,16 @@ class ORM_MPTT_Core extends ORM {
         $item->reload()->delete();
       }
 
-      // Deleting children has affected this item
-      $this->reload();
+      // Deleting children has affected this item, but we'll reload it below.
     }
 
     $this->lock();
     $this->reload();  // Assume that the prior lock holder may have changed this entry
+    if (!$this->loaded()) {
+      // Concurrent deletes may result in this item already being gone.  Ignore it.
+      return;
+    }
+
     try {
       db::build()
         ->update($this->table_name)
diff --git a/modules/gallery/models/item.php b/modules/gallery/models/item.php
index 891153d1..9016a04a 100644
--- a/modules/gallery/models/item.php
+++ b/modules/gallery/models/item.php
@@ -71,6 +71,11 @@ class Item_Model_Core extends ORM_MPTT {
   }
 
   public function delete($ignored_id=null) {
+    if (!$this->loaded()) {
+      // Concurrent deletes may result in this item already being gone.  Ignore it.
+      return;
+    }
+
     if ($this->id == 1) {
       $v = new Validation(array("id"));
       $v->add_error("id", "cant_delete_root_album");