From bb26062b14befe3f36f4f00cb8d7c9c061665742 Mon Sep 17 00:00:00 2001
From: Holger Vogt <holger.vogt@uni-due.de>
Date: Sun, 5 Jan 2020 10:50:56 +0100
Subject: [PATCH] patch provided by Vito (see
 https://sourceforge.net/p/ngspice/discussion/133842/thread/31aa24261e/ )

---
 src/xspice/evt/evtload.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/xspice/evt/evtload.c b/src/xspice/evt/evtload.c
index 903e5f2b4..1dc0368a7 100644
--- a/src/xspice/evt/evtload.c
+++ b/src/xspice/evt/evtload.c
@@ -340,6 +340,7 @@ static void EVTcreate_state(
 	{
         new_state = state_data->free[inst_index];
         state_data->free[inst_index] = new_state->next;
+        new_state->next = NULL; // reusing dirty memory: next must be reset
     }
     else 
 	{