--- a/QTfrontend/net/tcpBase.cpp	Wed Mar 14 21:46:07 2018 +0100
+++ b/QTfrontend/net/tcpBase.cpp	Wed Mar 14 22:57:31 2018 +0100
@@ -228,8 +228,10 @@
 {
     Q_UNUSED(exitStatus);
 
-    if(m_connected)
-      ClientDisconnect();
+    if(!m_connected) { // yes, it is intended to be like this
+      ClientDisconnect(); // need to do cleanup in case no connection occured,
+      //if m_connected is true, it is done automatically in socket disconnect handler
+    }
 
     // show error message if there was an error that was not an engine's
     // fatal error - because that one already sent a info via IPC