diff --git a/cpp/tglog.cc b/cpp/tglog.cc
index 9481234..e361537 100644
--- a/cpp/tglog.cc
+++ b/cpp/tglog.cc
@@ -129,6 +129,8 @@ namespace f8
                 impl_->save_cond->notify_all();
             }
         }
+        delete xobj;
+        xobj = nullptr;
     }
 
     void TGLog::SaveToFileThreadProc()