From 89ea46e39ac49f6de689dc01b2830c4d9bde06f8 Mon Sep 17 00:00:00 2001
From: Holger Vogt <holger.vogt@uni-due.de>
Date: Thu, 13 Feb 2020 21:32:02 +0100
Subject: [PATCH] prevent false freeing of vector

---
 src/frontend/parse.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/frontend/parse.c b/src/frontend/parse.c
index a1ac39fa4..cc86903d0 100644
--- a/src/frontend/parse.c
+++ b/src/frontend/parse.c
@@ -471,7 +471,7 @@ void free_pnode_x(struct pnode *t)
         free_pnode(t->pn_right);
         free_pnode(t->pn_next);
         tfree(t->pn_name); /* va: it is a copy() of original string, can be free'd */
-        if (t->pn_value && !(t->pn_value->v_flags & VF_PERMANENT)) {
+        if (t->pn_use == 1 && t->pn_value && !(t->pn_value->v_flags & VF_PERMANENT)) {
             vec_free(t->pn_value); /* patch by Stefan Jones */
         }
         txfree(t);