ext/pgsql: attempt to fix segfault on module shutdown with persistent resources when removing entries during module's lifetime

Author: devnexen

ext/pgsql/pgsql.c

@@ -307,8 +307,13 @@ static void php_pgsql_set_default_link(zend_object *obj)
 
 static void _close_pgsql_plink(zend_resource *rsrc)
 {
-	PGconn *link = (PGconn *)rsrc->ptr;
+	PGconn *link;
 	PGresult *res;
+	if (!rsrc || !rsrc->ptr) {
+		return;
+	}
+
+	link = (PGconn *)rsrc->ptr;
 
 	while ((res = PQgetResult(link))) {
 		PQclear(res);