Fix restart Segment Fault bug

Change-Id: I09891273dd9a3acd5ce396dbd890e08034dca9d7
diff --git a/gui/chronosharegui.cpp b/gui/chronosharegui.cpp
index 3159699..294588e 100644
--- a/gui/chronosharegui.cpp
+++ b/gui/chronosharegui.cpp
@@ -163,6 +163,8 @@
     m_ioServiceManager->handle_stop();
     m_NetworkThread.join();
     delete m_ioServiceManager;
+
+    m_face.reset();
   }
 
   fs::path realPathToFolder(m_dirPath.toStdString());