diff --git a/lib/bucky/core/database/test_data_operator.rb b/lib/bucky/core/database/test_data_operator.rb
index 8cab581d..8afad0a3 100644
--- a/lib/bucky/core/database/test_data_operator.rb
+++ b/lib/bucky/core/database/test_data_operator.rb
@@ -89,6 +89,7 @@ def get_ng_test_cases_at_last_execution(cond)
               }
             end
           end
+          @connector.disconnect
           re_test_cond
         end