OpenGL VAO,VBO,EBO accessviolation - opengl

Question

I have following code for loading a model (here it's a triangle) and load it up into my resourcemanager:
GLfloat vertices[] = {
-0.5f, -0.5f, 0.0f, // Left
0.5f, -0.5f, 0.0f, // Right
0.0f, 0.5f, 0.0f // Top
};
GLuint indices[] = {
0, 1, 2
};
ModelGroup* newGroup = new ModelGroup;
GLuint VBO;
glGenVertexArrays(1, &newGroup->vao);
glGenBuffers(1, &VBO);
glGenBuffers(1, &newGroup->ebo);
glBindVertexArray(newGroup->vao);
glBindBuffer(GL_ARRAY_BUFFER, VBO);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, 0);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, newGroup->ebo);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW);
glBindVertexArray(0);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
newGroup->vbos.push_back(VBO);
vertexCount = 3;
indiciesCount = 3;
modelGroups.insert(std::pair<GLchar*, ModelGroup*>("default", newGroup));
and following code to render my triangle:
GLuint vao = model->getVAO();
GLuint count = model->getIndicesCount();
glBindVertexArray(vao);
glDrawElements(GL_TRIANGLES, count, GL_UNSIGNED_INT, NULL);
glBindVertexArray(0);
This code doesn't work and throws an accessviolation-error.
I don't know why ... but here is the thing
If i instead write the load-code into my resourcemanager, write the same triangle-load-code into the constructor of the renderer-class it works. What did i wrong?
PS: it also works if i use the loaded triangle from the resourcemanager and write the same load-code into the renderer-class-constructor ... that's weird
Edit: I think i found the bug ... some how the vbo-, vao-, eboIDs is only accessable in the resourcemanager and if i write the load-code into the constructor of the renderer he creates the same IDs (which shouldn't or not?)
Has that something to do with the opengl-context? And how can i fix that?
Edit2: It's the same opengl-context but the vao outside of the resourcemanager-class is not a vao(checked with glIsVertexArray). Here is more code about my resourcemanager and it's structs for more clarity (updated also the code above).
Edit3: Already made some mistakes (updated code)
Also i can't render the triangle in other classes and i checked IDs, etc.
All IDs are correct. The triangle is correctly created. But at anytime i try to access the vao outside of the loader-class it throws a violation-exception.
Its drive me crazy ... i don't know what to do
Edit4: Yaay ... i got it to work, it was just a little fail on pointers but now it works :)
class Model {
public:
struct ModelGroup {
GLuint vao;
GLuint ebo;
std::vector<GLuint> vbos;
};
private:
GLuint vertexCount;
GLuint indiciesCount;
std::map<GLchar*, ModelGroup*> modelGroups;
public:
// all the getters ...
};