QT: Program crash on glDrawElements() - c++

Question

I wanted to load a model into OpenGL with Assimp.
I am using QT as my framework that provides me with the functions needed.
Baiscally, my program crashes at Mesh::DrawMesh at gl.glDrawElements()...
I bet it has to do with one of my allocations but I don't know.
I am sure the model is loaded correctly because I compared the loaded results ;)
So here I post the initialize function that basically sets up the buffers etc. for that mesh. I think that maybe something went wrong there:
void Mesh::initialize()
{
vao->create();
vbo->create();
ebo->create();
vao->bind();
vbo->bind(); //glBindBuffer(GL_ARRAY_BUFFER, vbo); // Bind vbo
vbo->setUsagePattern(QOpenGLBuffer::StaticDraw);
vbo->allocate(vertices.data(),vertices.size() * sizeof(Vertex)); //glBufferData(GL_ARRAY_BUFFER, vertices.size() * sizeof(Vertex), vertices.data(), GL_STATIC_DRAW); //Allocates space in bytes
ebo->bind(); //glBindBuffer(GL_ARRAY_BUFFER, ebo);
ebo->setUsagePattern(QOpenGLBuffer::StaticDraw);
ebo->allocate(indices.data(),indices.size()*sizeof(GLuint)); //glBufferData(GL_ELEMENT_ARRAY_BUFFER, indices.size() * sizeof(GLuint), indices.data(), GL_STATIC_DRAW); //Allocates space in bytes
program->enableAttributeArray(0); //glEnableVertexAttribArray(0); //On layout = 0
program->setAttributeBuffer(0,GL_FLOAT,0,sizeof(Vertex));//glVertexAttribPointer(0,3,GL_FLOAT,GL_FALSE,sizeof(Vertex),0); // Stride is sizeof(Vertex) ofc, offset is 0 because we want to access Position
program->enableAttributeArray(1); //glEnableVertexAttribArray(1);
program->setAttributeBuffer(1,GL_FLOAT,offsetof(Vertex,Normal),3,sizeof(Vertex)); //glVertexAttribPointer(1,3,GL_FLOAT,GL_FALSE,sizeof(Vertex), (GLvoid*) offsetof(Vertex, Normal));
program->enableAttributeArray(2);
program->setAttributeBuffer(2,GL_FLOAT,offsetof(Vertex,TextCoords),2,sizeof(Vertex));//glVertexAttribPointer(2,2,GL_FLOAT,GL_FALSE,sizeof(Vertex), (GLvoid*) offsetof(Vertex, TextCoords));
vao->release();
}
This is my Draw method that gets called when the program is bound:
void Mesh::DrawMesh(QOpenGLFunctions_3_3_Core& gl)
{
vao->bind();
qDebug() << vertices.size();
gl.glDrawElements(GL_TRIANGLES, indices.size(),GL_UNSIGNED_INT,0);
vao->release();
}
Vertex Shader:
#version 330 core
layout(location=0) in vec3 position;
layout(location=1) in vec3 normal;
layout(location=2) in vec2 textCoords;
uniform mat4 MVP;
out vec4 color;
void main(void)
{
gl_Position= MVP*vec4(position,1);
color = vec4(0.5,0.5,0.5,0.5);
}
InitializeGL function of my QOpenGLWidget:
void RenderingWindow::initializeGL()
{
this->initializeOpenGLFunctions();
program.create();
program.addShaderFromSourceFile(QOpenGLShader::Vertex, ":/testvert.vert" );
program.addShaderFromSourceFile(QOpenGLShader::Fragment, ":/testfrag.frag");
program.link();
program.bind();
this->glEnable(GL_DEPTH_TEST);
Camera::instance().LookAt(0,0,10, 0,0,0 ,0,1,0);
model.SetProgram(&program);
model.LoadModel(*this, "C:/Users/TestCube.fbx");
program.release();
}
This is my Vertex struct:
struct Vertex
{
QVector3D Position;
QVector3D Normal;
QVector2D TextCoords;
};