Usual pointer causing Segmentation Fault

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C++

QT

My class "ComponentArea" looks like this:

#ifndef COMPONENTAREA_H
#define COMPONENTAREA_H

#include <QObject>
#include <QWidget>
#include <QScrollArea>
#include <QtDesigner/QtDesigner>
#include <QMouseEvent>
#include <QPainter>

#include <Components/Sockets/socket.h>
class Socket;

class ComponentArea : public QScrollArea
{
    Q_OBJECT

    public:
        ComponentArea(QWidget* parent);

        void connectSockets(Socket* a, Socket* b);
        void childBlock_childSocket_mousePressEvent(Socket* sender, QMouseEvent* event);
        void childBlock_childSocket_mouseReleaseEvent(Socket* sender, QMouseEvent* event);

    private:
        Socket* pressedSocket;

        void mouseReleaseEvent(QMouseEvent *event);
};

#endif // COMPONENTAREA_H

In the constructor, I set pressedSocket to 0:

pressedSocket = 0;

Whenever I try to use pressedSocket, in one of the events, I get a Segmentation Fault:

void ComponentArea::childBlock_childSocket_mousePressEvent(Socket *sender, QMouseEvent *event)
{
    if((pressedSocket == 0) && (event->button() == Qt::LeftButton)) //SIGSEGV here
    {
        pressedSocket = sender;
    }
}

When I try to inspect pressedSocket at this line, the Debugger tells me "pressedSocket <no such value>".

I don't see what I am doing wrong. Any advices? Thanks in advance!