heck environment closed status before closing a cursors. Fixes #763928.
diff --git a/Modules/_bsddb.c b/Modules/_bsddb.c
index 227fe7b..990c89f 100644
--- a/Modules/_bsddb.c
+++ b/Modules/_bsddb.c
@@ -774,7 +774,14 @@
int err;
if (self->dbc != NULL) {
MYDB_BEGIN_ALLOW_THREADS;
- if (self->mydb->db != NULL)
+ /* If the underlying database has been closed, we don't
+ need to do anything. If the environment has been closed
+ we need to leak, as BerkeleyDB will crash trying to access
+ the environment. There was an exception when the
+ user closed the environment even though there still was
+ a database open. */
+ if (self->mydb->db && self->mydb->myenvobj &&
+ !self->mydb->myenvobj->closed)
err = self->dbc->c_close(self->dbc);
self->dbc = NULL;
MYDB_END_ALLOW_THREADS;