Access violation writing location 0xcccccccc on passing arguments

Question

I am kind of struggling with this Access violation writing location.

I have two classes:

The first one-

class_A
{
private:
    struct Complex
    {
        float time;
        vector<vector<float>> matrix;
    };

    Complex m_tempStruct;
    ConnectivityMatrix* p_ConnMatrix;  //pointer to the second class

    void functionOfClass_A()
    {
        ...
        p_ConnMatrix->functionOfClass_ConnectivityMatrix(m_tempStruct.time, &m_tempStruct.matrix); //sending float and a pointer to vector<vector<float>>
        ...
    }
};

The second one-

class ConnectivityMatrix
{
private:
    struct Complex
    {
        float time;
        vector<vector<float>> matrix;
    };

    Complex m_tempStruct;
    vector<Complex> m_mainVectorConnectivity;

public:
    void functionOfClass_ConnectivityMatrix(float time, vector<vector<float>>* matrix)
    {
        ...
        m_tempStruct.time = time;  //  <--- crashes here
        m_tempStruct.matrix = *matrix;
        m_mainVectorConnectivity.push_back(m_tempStruct);
        ...
    }
};

I can see that time holds a float value and matrix holds two dimension vector of float. but I can't understand why I get this Access violation when I try to assign it on m_tempStruct.time

I will be happy for help on this one.

Thanks.