diff --git a/panda/src/pgraph/pandaNodeChain.I b/panda/src/pgraph/pandaNodeChain.I
index a9def9f617..9174ae21ea 100644
--- a/panda/src/pgraph/pandaNodeChain.I
+++ b/panda/src/pgraph/pandaNodeChain.I
@@ -35,4 +35,6 @@ PandaNodeChain() :
 ////////////////////////////////////////////////////////////////////
 INLINE PandaNodeChain::
 ~PandaNodeChain() {
+  _next = NULL;
+  _prev = NULL;
 }