diff --git a/libraries/chain/CMakeLists.txt b/libraries/chain/CMakeLists.txt
index 399720fa..338e1d25 100644
--- a/libraries/chain/CMakeLists.txt
+++ b/libraries/chain/CMakeLists.txt
@@ -100,6 +100,7 @@ add_library( graphene_chain
              sport_evaluator.cpp
              protocol/event_group.cpp
              event_group_evaluator.cpp
+             event_group_object.cpp
              protocol/event.cpp
              event_evaluator.cpp
              event_object.cpp
diff --git a/libraries/chain/event_group_evaluator.cpp b/libraries/chain/event_group_evaluator.cpp
index 9faaf7e4..ef7ad18f 100644
--- a/libraries/chain/event_group_evaluator.cpp
+++ b/libraries/chain/event_group_evaluator.cpp
@@ -109,9 +109,7 @@ void_result event_group_delete_evaluator::do_apply(const event_group_delete_oper
     database& _db = db();
     
     const auto& event_group = _db.get(op.event_group_id);
-    _db.modify(event_group, [&](event_group_object& mutable_event_group) {
-        mutable_event_group.cancel_events(_db);
-    });
+    event_group.cancel_events(_db);
     
     _db.remove(event_group);
     return void_result();
diff --git a/libraries/chain/event_group_object.cpp b/libraries/chain/event_group_object.cpp
index c9350724..0bbee3c3 100644
--- a/libraries/chain/event_group_object.cpp
+++ b/libraries/chain/event_group_object.cpp
@@ -6,7 +6,7 @@
 
 namespace graphene { namespace chain {
     
-void event_group_object::cancel_events(database& db)
+void event_group_object::cancel_events(database& db) const
 {
     const auto& events_for_group = db.get_index_type<event_object_index>().indices().get<by_event_group_id>();
     auto event_it = events_for_group.lower_bound(id);
diff --git a/libraries/chain/include/graphene/chain/event_group_object.hpp b/libraries/chain/include/graphene/chain/event_group_object.hpp
index 231bf8f0..fb2e5e05 100644
--- a/libraries/chain/include/graphene/chain/event_group_object.hpp
+++ b/libraries/chain/include/graphene/chain/event_group_object.hpp
@@ -42,7 +42,7 @@ class event_group_object : public graphene::db::abstract_object< event_group_obj
       internationalized_string_type name;
       sport_id_type sport_id;
     
-      void cancel_events(database& db);
+      void cancel_events(database& db) const;
 };
 
 typedef multi_index_container<
diff --git a/libraries/chain/include/graphene/chain/protocol/operations.hpp b/libraries/chain/include/graphene/chain/protocol/operations.hpp
index 13b6d872..dc66917e 100644
--- a/libraries/chain/include/graphene/chain/protocol/operations.hpp
+++ b/libraries/chain/include/graphene/chain/protocol/operations.hpp
@@ -106,10 +106,8 @@ namespace graphene { namespace chain {
             tournament_leave_operation,
             sport_create_operation,
             sport_update_operation,
-            sport_delete_operation,
             event_group_create_operation,
             event_group_update_operation,
-            event_group_delete_operation,
             event_create_operation,
             event_update_operation,
             betting_market_rules_create_operation,
@@ -126,7 +124,9 @@ namespace graphene { namespace chain {
             bet_canceled_operation, // VIRTUAL
             betting_market_group_update_operation,
             betting_market_update_operation,
-            event_update_status_operation
+            event_update_status_operation,
+            sport_delete_operation,
+            event_group_delete_operation
          > operation;
 
    /// @} // operations group
diff --git a/libraries/chain/sport_evaluator.cpp b/libraries/chain/sport_evaluator.cpp
index 43329e10..c073fed4 100644
--- a/libraries/chain/sport_evaluator.cpp
+++ b/libraries/chain/sport_evaluator.cpp
@@ -81,17 +81,22 @@ void_result sport_delete_evaluator::do_evaluate( const sport_delete_operation& o
 void_result sport_delete_evaluator::do_apply( const sport_delete_operation& op )
 { try {
    database& _db = db();
+   
+   std::vector<const event_group_object*> event_groups_to_remove;
     
    const auto& event_group_by_sport_id = _db.get_index_type<event_group_object_index>().indices().get<by_sport_id>();
    auto event_group_it = event_group_by_sport_id.lower_bound(op.sport_id);
    auto event_group_end_it = event_group_by_sport_id.upper_bound(op.sport_id);
    for (; event_group_it != event_group_end_it; ++event_group_it)
    {
-      _db.modify(*event_group_it, [&](event_group_object& event_group) {
-          event_group.cancel_events(_db);
-      });
+      event_group_it->cancel_events(_db);
+      event_groups_to_remove.push_back(&*event_group_it);
       
-      _db.remove(*event_group_it);
+   }
+   
+   for (auto event_group: event_groups_to_remove)
+   {
+      _db.remove(*event_group);
    }
     
    _db.remove(_db.get(op.sport_id));