Debug assertion failed-vector subscript out of range. (Snake game)

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C++

VC++

#include "stdafx.h"
#include <vector>
#include <limits>
#include <algorithm>


#include <SFML/Graphics.hpp>
#include <iostream>
int t = 0;
sf::RectangleShape addsnake();
std::vector<sf::RectangleShape>snake;


sf::RectangleShape addsnake(){
	std::vector<sf::RectangleShape>snake;
	snake[0].setFillColor(sf::Color::Red);
	snake[0].setPosition(100, 100);
	snake[0].setSize(sf::Vector2f(20, 20));
	return snake[t];

}
bool intersects(const sf::RectangleShape & r1, const sf::RectangleShape & r2){
	sf::FloatRect snake = r1.getGlobalBounds();
	sf::FloatRect spawnedFruit = r2.getGlobalBounds();
	return snake.intersects(spawnedFruit);

}

sf::RectangleShape generateFruit() {


	sf::RectangleShape fruit;
	fruit.setFillColor(sf::Color::Yellow);
	int fruitx = rand() % 400;
	int fruity = rand() % 400;
	fruit.setPosition(fruitx, fruity);
	fruit.setSize(sf::Vector2f(5, 5));

	return fruit;


}
int main()
{
	srand(time(NULL));
	int width = 400;
	int height = 400;
	sf::VideoMode videomode(width, height);
	sf::RenderWindow window(videomode, "Snake");
	
		
	

	
	sf::Clock clock;
	sf::Time t1 = sf::seconds(20);
	sf::RectangleShape spawnedFruit;
	while (window.isOpen()) {
		window.clear();
		window.draw(snake[0]);



		sf::Time elapsed1 = clock.getElapsedTime();
		if (elapsed1 >= t1) {


			spawnedFruit = generateFruit();

			clock.restart();

		}

		window.draw(spawnedFruit);

		window.display();
		sf::Event event;
		while (window.pollEvent(event))
		{
			if ((event.type == sf::Event::Closed) ||
				((event.type == sf::Event::KeyPressed) && (event.key.code == sf::Keyboard::Escape)))
				window.close();
		}


		if (sf::Keyboard::isKeyPressed(sf::Keyboard::Up))

			snake[0].move(0, -0.1);
		else if (sf::Keyboard::isKeyPressed(sf::Keyboard::Down))
			snake[0].move(0, 0.1);
		else if (sf::Keyboard::isKeyPressed(sf::Keyboard::Left))
			snake[0].move(-0.1, 0);
		else if (sf::Keyboard::isKeyPressed(sf::Keyboard::Right))
			snake[0].move(0.1, 0);

		if (intersects(snake[0], spawnedFruit))
			
				t++;

				snake.push_back(addsnake()); 
			
			







	}

}

Why am I getting this Debug assertion error? Could you please help me? (IDE Visual C++ 2013)

What I have tried:

I've tried changing snake.push_back(addsnake()) to snake.push_back(snake[t]), same problem . I also searched the internet for solutions but none of them were exactly like my problem and so they didn't work. I've also tried using a class but I'm not good at using classes yet (I'm a beginner).