--- libnl-3.5.0/lib/cache_mngr.c	2019-09-01 14:44:42.000000000 +0200
+++ src/lib/cache_mngr.c	2021-03-05 13:17:56.375572281 +0100
@@ -196,6 +196,7 @@
 
 errout_free_sync_sock:
 	nl_socket_free(mngr->cm_sync_sock);
+	mngr->cm_sync_sock = NULL;
 errout:
 	nl_cache_mngr_free(mngr);
 	return err;