Unable to access members of same class, giving seg fault

[PstdEr]

I am trying to create a slot from object to other
frame to log , but both belongs to same class

when trying to access objects placed on log , they are becoming invalid.

how to solve the problem?

QWidget* ApplicationLog::createLogWindow()
{
  m_pCmdLogHL = new QHBoxLayout(this);
  m_pLogTE =    new QTextEdit(this);
  m_pCmdLogHL->addWidget(m_pLogTE);
}

QWidget* ApplicationLog::createLogWindow()
{
  m_pCmdLogHL = new QHBoxLayout(this);
  m_pLogTE =    new QTextEdit(this);
  m_pCmdLogHL->addWidget(m_pLogTE);
}

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QWidget* ApplicationLog::createFrameWindow()
{
    m_pButtonsHL = new QHBoxLayout(this);
    m_pMinMaxBut = new Button(this,"Minimize");
     connect(m_pMinMaxBut,SIGNAL(clicked()),this,SLOT(logWindowMinMax()));
m_bIsMaximize = 1;
}

QWidget* ApplicationLog::createFrameWindow()
{
    m_pButtonsHL = new QHBoxLayout(this);
    m_pMinMaxBut = new Button(this,"Minimize");
     connect(m_pMinMaxBut,SIGNAL(clicked()),this,SLOT(logWindowMinMax()));
m_bIsMaximize = 1;
}

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void ApplicationLog::logWindowMinMax()
{
    qDebug()<<"slot invoked"  ;
    if(m_bIsMaximize)
      {
        m_pLogTE->setVisible(false);
        m_pMinMaxBut->setTooltip("Maximize");
        m_bIsMaximize = 0;
     }
    else
    {
       m_pLogTE->setVisible(true);       
       m_bIsMaximize = 1;
       m_pMinMaxBut->setTooltip("Minimize");
    }
}

void ApplicationLog::logWindowMinMax()
{
    qDebug()<<"slot invoked"  ;
    if(m_bIsMaximize)
      {
        m_pLogTE->setVisible(false);
        m_pMinMaxBut->setTooltip("Maximize");
        m_bIsMaximize = 0;
     }
    else
    {
       m_pLogTE->setVisible(true);       
       m_bIsMaximize = 1;
       m_pMinMaxBut->setTooltip("Minimize");
    }
}

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in the main window i am calling

QWidget* frame = framewindow->createFrameWindow();
  QWidget* log = logwindow->createLogWindow();

QWidget* frame = framewindow->createFrameWindow();
  QWidget* log = logwindow->createLogWindow();

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this particular line is giving problem (segmentation)

m_pLogTE->setVisible(false);

m_pLogTE->setVisible(false);

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why is it wrong to access that object,how to access the object?