if (vl->plugin_instance[0] == '\0') {
ssnprintf(ret, ret_len, "%s%s.%s",
prefix, vl->plugin, ds_name);
- } else if (vl->type_instance == '\0') {
+ } else if (vl->type_instance[0] == '\0') {
ssnprintf(ret, ret_len, "%s%s.%s.%s.%s",
prefix, vl->plugin, vl->plugin_instance,
vl->type_instance, ds_name);