concurrent CTL

src/knot/ctl/commands.c

@@ -863,7 +863,8 @@ static int zone_txn_begin_l(zone_t *zone, _unused_ ctl_args_t *args)
 		return KNOT_TXN_EEXISTS;
 	}
 
-	if (zone->backup_ctx != NULL && zone->backup_ctx->restore_mode) {
+	struct zone_backup_ctx *backup_ctx = zone->backup_ctx;
+	if (backup_ctx != NULL && backup_ctx->restore_mode) {
 		log_zone_warning(zone->name, "zone restore pending, try opening control transaction later");
 		return KNOT_EAGAIN;
 	}