diff --git a/runtime/legion/legion_config.h b/runtime/legion/legion_config.h
index 7ccd116cae..61bb752262 100644
--- a/runtime/legion/legion_config.h
+++ b/runtime/legion/legion_config.h
@@ -1156,6 +1156,7 @@ typedef enum legion_error_t {
   ERROR_EXCEEDED_MAXIMUM_NUMBER_LOCAL_FIELDS = 387,
   ERROR_UNABLE_ALLOCATE_LOCAL_FIELD = 388,
   ERROR_TASK_ATTEMPTED_ALLOCATE_FIELD = 389,
+  ERROR_DEFERRED_BUFFER_DOUBLE_DELETE = 390,
   //ERROR_PREDICATED_TASK_LAUNCH_FOR_TASK = 392,
   ERROR_PREDICATED_INDEX_TASK_LAUNCH = 393,
   ERROR_ATTEMPTED_INLINE_MAPPING_REGION = 395,
diff --git a/runtime/legion/legion_context.cc b/runtime/legion/legion_context.cc
index 8d6f76a25a..66a9252851 100644
--- a/runtime/legion/legion_context.cc
+++ b/runtime/legion/legion_context.cc
@@ -623,9 +623,11 @@ namespace Legion {
     {
       std::map<PhysicalInstance,LgEvent>::iterator finder =
         task_local_instances.find(instance);
-#ifdef DEBUG_LEGION
-      assert(finder != task_local_instances.end());
-#endif
+      if (finder == task_local_instances.end())
+        REPORT_LEGION_ERROR(ERROR_DEFERRED_BUFFER_DOUBLE_DELETE,
+            "Detected double deletion of deferred buffer " IDFMT
+            "in parent task %s (UID %lld).",
+            instance.id, get_task_name(), get_unique_id())
       task_local_instances.erase(finder);
       MemoryManager *manager = 
         runtime->find_memory_manager(instance.get_location());
diff --git a/runtime/legion/region_tree.inl b/runtime/legion/region_tree.inl
index 40c1ece091..54d4a194ba 100644
--- a/runtime/legion/region_tree.inl
+++ b/runtime/legion/region_tree.inl
@@ -3885,6 +3885,7 @@ namespace Legion {
       {
         const DomainPoint color = 
           partition->color_space->delinearize_color_to_point(*itr);
+        ApEvent child_ready;
         Realm::IndexSpace<DIM,T> child_space;
         if (future_map_domain.contains(color))
         {
@@ -3910,11 +3911,12 @@ namespace Legion {
               context->runtime->profiler->add_partition_request(requests,
                                               op, DEP_PART_INTERSECTIONS);
             Realm::IndexSpace<DIM,T> result;
-            ApEvent ready(Realm::IndexSpace<DIM,T>::compute_intersection(
-                parent_space, child_space, result, requests, parent_ready));
+            child_ready = ApEvent(
+                Realm::IndexSpace<DIM,T>::compute_intersection(
+                  parent_space, child_space, result, requests, parent_ready));
             child_space = result;
-            if (ready.exists())
-              result_events.insert(ready);
+            if (child_ready.exists())
+              result_events.insert(child_ready);
           }
         }
         else
@@ -3922,7 +3924,7 @@ namespace Legion {
         IndexSpaceNodeT<DIM,T> *child = 
             static_cast<IndexSpaceNodeT<DIM,T>*>(
                 partition->get_child(*itr));
-        if (child->set_realm_index_space(child_space, ApEvent::NO_AP_EVENT))
+        if (child->set_realm_index_space(child_space, child_ready))
           delete child;
       }
       if (result_events.empty())