From 139e851f22783da8f5ba3e99ae70e4fa34cdc77a Mon Sep 17 00:00:00 2001
From: "John J. Camilleri" <john@digitalgrammars.com>
Date: Fri, 24 Sep 2021 08:20:31 +0200
Subject: [PATCH] Add null check before freeing DB

Was causing segfaults in load-failure tests
---
 src/runtime/python/pypgf.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/runtime/python/pypgf.c b/src/runtime/python/pypgf.c
index dbf15ee7e..eeb76f7d5 100644
--- a/src/runtime/python/pypgf.c
+++ b/src/runtime/python/pypgf.c
@@ -13,7 +13,8 @@
 static void
 PGF_dealloc(PGFObject *self)
 {
-    pgf_free_revision(self->db, self->revision);
+    if (self->db != NULL && self->revision != 0)
+        pgf_free_revision(self->db, self->revision);
     Py_TYPE(self)->tp_free((PyObject *)self);
 }