diff --git a/source3/rpcclient/cmd_netlogon.c b/source3/rpcclient/cmd_netlogon.c
index 0a8ab205f8a..744361c4a47 100644
--- a/source3/rpcclient/cmd_netlogon.c
+++ b/source3/rpcclient/cmd_netlogon.c
@@ -800,6 +800,11 @@ static NTSTATUS cmd_netlogon_sam_logon(struct rpc_pipe_client *cli,
 	if (argc == 6)
 		sscanf(argv[5], "%x", &logon_param);
 
+	if (rpcclient_netlogon_creds == NULL) {
+		result = NT_STATUS_UNSUCCESSFUL;
+		goto done;
+	}
+
 	/* Perform the sam logon */
 
 	result = rpccli_netlogon_password_logon(rpcclient_netlogon_creds,