diff -u10 -r objcryst-2017.2/Fox/src/FoxServerThread.cpp objcryst-2017.2.patched/Fox/src/FoxServerThread.cpp
--- objcryst-2017.2/Fox/src/FoxServerThread.cpp	2017-06-28 22:21:21.000000000 +0200
+++ objcryst-2017.2.patched/Fox/src/FoxServerThread.cpp	2018-10-18 14:59:57.640722872 +0200
@@ -63,21 +63,21 @@
 
       //is still connected?
       if(!m_pSocket->IsConnected()) {
           CloseConnection();
           wxThread::Sleep(1000);
           break;
       }
 
       if(m_tThreadMutex->Lock()!=wxMUTEX_NO_ERROR) {
           WriteLogMessage(_T("m_tThreadMutex locking error (Entry)"));
-          return false;
+          return 0;
       }
 
       WriteLogMessage(_T("Looping"));
 
       if(m_newEvt){
           m_newEvt=false;
          switch(m_sckt_ntf)
          {
            case INPUT_MSG:
            {