Qt 5.4 sudden segfault when calling invokable c++ function from qml

[motaito]

Hi,

I have these two situations:

class myClass
{
	...
}
 
class myModel : public QAbstractTableMOdel
{
public:
	...
	Q_INVOKABLE myClass getElement(int index)
	{
		if(0 > index || index >= m_Data.size())
			return 0;
 
		return m_Data[index];
	}
 
private:
	QList<myClass> m_Data;
}

class myClass
{
	...
}

class myModel : public QAbstractTableMOdel
{
public:
	...
	Q_INVOKABLE myClass getElement(int index)
	{
		if(0 > index || index >= m_Data.size())
			return 0;

		return m_Data[index];
	}

private:
	QList<myClass> m_Data;
}

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calling the getElement(index) function from qml works just fine. However, if I change to pointers like so:

class myClass : public QObject
{
	Q_OBJECT
	...
}
 
class myModel : public QAbstractTableMOdel
{
public:
	...
	Q_INVOKABLE myClass* getElement(int index)
	{
		if(0 > index || index >= m_Data.size())
			return 0;
 
		return m_Data[index];
	}
 
private:
	QList<myClass*> m_Data;
}

class myClass : public QObject
{
	Q_OBJECT
	...
}

class myModel : public QAbstractTableMOdel
{
public:
	...
	Q_INVOKABLE myClass* getElement(int index)
	{
		if(0 > index || index >= m_Data.size())
			return 0;

		return m_Data[index];
	}

private:
	QList<myClass*> m_Data;
}

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Then it first works fine as well. But every now and then I get a segfault when calling the getElement(index) function from qml. I don't understand how it can work most of the time but suddenly create a segfault. Also, I have no clue how to debug it any further. I narrowed it down to the actual function call but I have no clue why it would give a segfault. Can anyone tell my why this might be happening?