free(): double free detected in tcache 2 with variadic functions

Question

I was wondering if anyone of you could answer the question I am currently facing at.

After i compiled my code with g++ without any problems, i tried to execute the file. The window which i programmed with SFML opened for a very short time and closed right after that. My terminal gave me this error:

free(): double free deteted in tcache 2

The compiling command like this:

g++ main.cpp CObject.hpp CObject.cpp CFramework.hpp CFramework.cpp -o main.exe -lsfml-graphics -lsfml-window -lsfml-system

And the code like this:

CObject.hpp :

#include <SFML/Graphics.hpp>

#ifndef COBJECT_HPP
#define COBJECT_HPP

class CObject{
    public:
      CObject();
      ~CObject();

      void init(void);

      template <typename T, typename... Ts>
      void init(T vertex, Ts... vertex1);
      void setColor(sf::Color color);
      int m_vertexCount;
      sf::Vertex *m_vertexArray;
};

#endif

#include "CObject.tpp"

CObject.cpp :

#include "CObject.hpp"

CObject::CObject(void){
  m_vertexCount = 1;
  m_vertexArray = (sf::Vertex*) malloc(m_vertexCount * sizeof(sf::Vertex));

  if(m_vertexArray == NULL){exit(EXIT_FAILURE);}
}

CObject::~CObject(void){
  free(m_vertexArray);
}

void CObject::init(void){
  if(m_vertexArray == NULL){exit(EXIT_FAILURE);}
}

void CObject::setColor(sf::Color color){
  for(int i = 0; i < m_vertexCount; i++){
    m_vertexArray[i].color = color;
  }
}

COBject.tpp :

template <typename T, typename... Ts>
void CObject::init(T vertex, Ts... vertex1){
  if(m_vertexCount == 1){
    m_vertexArray[0] = (sf::Vertex) vertex;

    m_vertexCount += 1;
    m_vertexArray = (sf::Vertex*) realloc(m_vertexArray, m_vertexCount * sizeof(sf::Vertex));

    if(m_vertexArray == NULL){  exit(EXIT_FAILURE); }
  }else{
    m_vertexArray[m_vertexCount-1] = (sf::Vertex) vertex;

    m_vertexCount += 1;
    m_vertexArray = (sf::Vertex*) realloc(m_vertexArray, m_vertexCount * sizeof(sf::Vertex));

    if(m_vertexArray == NULL){  exit(EXIT_FAILURE); }
  }

  init(vertex1...);
}

CFramework.hpp :

#include <SFML/Window.hpp>
#include <SFML/Graphics.hpp>

#include "CObject.hpp"

#ifndef CFRAMEWORK_HPP
#define CFRAMEWORK_HPP

class CFramework{
public:
  CFramework();
  void init(int windowWidth, int windowHeight);
  void reset();
  void renderVertex(CObject object);
  void display();
  void close();

  sf::Event::EventType getEvent();
  sf::Event getKeyPressed();
  void handleWindowEvent(sf::Event::EventType windowEvent);

  static CFramework* getInstance();

  bool windowIsAlive;

protected:
  sf::RenderWindow window;
  sf::Event event;

private:
  static CFramework* Framework;
};

#endif

CFramework.cpp :

#include "CFramework.hpp"

CFramework::CFramework(){
  windowIsAlive = false;
}

CFramework* CFramework::Framework = NULL;

CFramework* CFramework::getInstance(){
  if(Framework == NULL){
    Framework = new CFramework;
  }

  return Framework;
}

void CFramework::init(int windowWidth, int windowHeight){
  window.create(sf::VideoMode(windowWidth, windowHeight), "Physics Simulation");

  windowIsAlive = true;
}

void CFramework::close(){
  window.close();
}

void CFramework::display(){
  window.display();
}

void CFramework::reset(){
  window.clear();
}

void CFramework::handleWindowEvent(sf::Event::EventType windowEvent){
  if(windowEvent == sf::Event::Closed){
    close();
    windowIsAlive = false;
  }
}

sf::Event::EventType CFramework::getEvent(){
  window.pollEvent(event);
  return event.type;
}

void CFramework::renderVertex(CObject object){
  window.draw(object.m_vertexArray, object.m_vertexCount, sf::TriangleStrip);
}

And lastly main.cpp :

#include "CFramework.hpp"

CFramework* Framework = CFramework::getInstance();

int main()
{
  CObject object;
  object.init(sf::Vertex(sf::Vector2f(10.f, 20.f), sf::Color::Red), sf::Vertex(sf::Vector2f(20.f, 20.f), sf::Color::Red), sf::Vertex(sf::Vector2f(20.f, 30.f), sf::Color::Red));

  Framework->init(600, 800);
  while(Framework->windowIsAlive == true){
    sf::Event::EventType eventType = Framework->getEvent();
    Framework->handleWindowEvent(eventType);
    Framework->reset();
    Framework->renderVertex(object);
    Framework->display();
  }
  return 0;
}

I think that my problem lays in the CObject files, but i yet wasn't able to find it.

Any help is appreciated.