connect() terminates the program

[saman_artorious]

I get a weird program termination when I use connect() in my code. I checked the code properly, i don't know where the mistake comes from:

I call construct the control object in MainWindow and call its init()

void Control::initObjects()
{
    logger  = new ErrorLogger();
 
   X    = new Xr();
 
   Y  = new Y();
 
    Z = new Z();
 
    rs_485  = new rs485();
 
    establishConnections();
}
 
void Control::establishConnections()
{
    connect(X       , SIGNAL(logMessage(const char* )), logger, SLOT(logMessage(const char* )));
    connect(Y       , SIGNAL(logMessage(const char* )), logger, SLOT(logMessage(const char* )));
    connect(Z       , SIGNAL(logMessage(const char* )), logger, SLOT(logMessage(const char* )));
    connect(rs485 , SIGNAL(logMessage(const char* )), logger, SLOT(logMessage(const char* )));
}

void Control::initObjects()
{
    logger  = new ErrorLogger();

   X    = new Xr();

   Y  = new Y();

    Z = new Z();

    rs_485  = new rs485();

    establishConnections();
}

void Control::establishConnections()
{
    connect(X       , SIGNAL(logMessage(const char* )), logger, SLOT(logMessage(const char* )));
    connect(Y       , SIGNAL(logMessage(const char* )), logger, SLOT(logMessage(const char* )));
    connect(Z       , SIGNAL(logMessage(const char* )), logger, SLOT(logMessage(const char* )));
    connect(rs485 , SIGNAL(logMessage(const char* )), logger, SLOT(logMessage(const char* )));
}

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the last connect terminates my program, thought the first 3 work properly.