From 8cac0918334edc59e7f8c3800e7663d1ab41373d Mon Sep 17 00:00:00 2001
From: Szczepan Zalega <szczepan@nitrokey.com>
Date: Mon, 24 Apr 2017 13:58:46 +0200
Subject: Return empty value on no connection

Signed-off-by: Szczepan Zalega <szczepan@nitrokey.com>
---
 NitrokeyManager.cc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/NitrokeyManager.cc b/NitrokeyManager.cc
index d2403c1..9fbd303 100644
--- a/NitrokeyManager.cc
+++ b/NitrokeyManager.cc
@@ -201,6 +201,7 @@ char * strndup(const char* str, size_t maxlen){
 
 
     string NitrokeyManager::get_serial_number() {
+        if (device == nullptr) { return ""; };
       switch (device->get_device_model()) {
         case DeviceModel::PRO: {
           auto response = GetStatus::CommandTransaction::run(device);
-- 
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