fixed crash on termination if proxies were excluded

ClientContext.cpp

@@ -99,16 +99,22 @@ namespace client
 	}
 		
 	void ClientContext::Stop ()
+	{
+		if (m_HttpProxy)
 		{
 			LogPrint(eLogInfo, "Clients: stopping HTTP Proxy");
 			m_HttpProxy->Stop();
 			delete m_HttpProxy;
 			m_HttpProxy = nullptr;
+		}
 
+		if (m_SocksProxy)
+		{
 			LogPrint(eLogInfo, "Clients: stopping SOCKS Proxy");
 			m_SocksProxy->Stop();
 			delete m_SocksProxy;
 			m_SocksProxy = nullptr;
+		}
 
 		for (auto& it: m_ClientTunnels)
 		{