Index: doc/generic_types/evaluation/cpp-vstack.cpp
===================================================================
--- doc/generic_types/evaluation/cpp-vstack.cpp	(revision b276be54f19d3e800f3e97e609d486c6f53f3bf5)
+++ doc/generic_types/evaluation/cpp-vstack.cpp	(revision 2f0fc56893ae1bb4b938a671bb0cbd87da24f81f)
@@ -25,4 +25,5 @@
 		delete crnt;
 	}
+	head = nullptr;
 }