--- "src_original\\qtbase\\src\\xml\\dom\\qdom.cpp"	2020-01-24 14:54:31.000000000 +0900
+++ "src\\qtbase\\src\\xml\\dom\\qdom.cpp"	2020-09-04 16:00:04.650289300 +0900
@@ -4117,7 +4117,8 @@
     // keep the refcount balanced: appendChild() does a ref anyway.
     t->ref.deref();
     if (first) {
-        delete removeChild(first);
+        auto removed = removeChild(first);
+    	if(removed && !removed->ref) delete removed;
     }
     appendChild(t);
 }