SIGSEGV Codeblocks

Good afternoon! I have to finish a work of a game for the university and I have the typical problem of "sometimes it works". I tell you above: it's a game where you take a character, if the enemies touch you, the game ends and you take points that appear randomly.

struct EstrellasRep{
    Estrella * s;
    int maximo, n;
    };

Estrellas EstrellasCrea (int maximo){
    Estrellas e = malloc (sizeof(struct EstrellasRep));
    e->n=0;
    e->maximo=maximo;
    return e;
    }

void EstrellasLibera (Estrellas e){
    for (int i=0; i<e->n; i++) EstrellaLibera(e->s[i]);
    free(e->s);
    free(e);
}
void EstrellasDibuja (Estrellas e){
    for (int i=0; i<e->n; i++) EstrellaDibuja(e->s[i]);
}
int EstrellasColisiona (Estrellas e, int x, int y, int w, int h){
    int i=0;
    int colisiona=0;
    while(i<e->n){
        if (colision(EstrellaGetX(e->s[i]),EstrellaGetY(e->s[i]),EstrellaGetW(e->s[i]), EstrellaGetH(e->s[i]),x,y,w,h))
    {
        EstrellaLibera(e->s[i]);
        e->s[i]=e->s[e->n-1];
        e->n--;
        colisiona++;
    }
    else i++;
}
return colisiona;
}

void EstrellasInserta (Estrellas e, Imagen i, int x, int y, int w, int h)
{
     if (e->n<e->maximo) {
        e->s[e->n] = EstrellaCrea(i,x,y,w,h);
        e->n++;
    }
}

the sigsev comes to me on the line e-> s [e-> n] = EstrellaCrea (i, x, y, w, h);

And I say, sometimes it goes xD Greetings

Edit:

Stars is a structure that leads to the set of Star, which are the points that must be collected.     struct EstrellaRep {        Image i;        int x, y, w, h, r, cx, cy;        };

Estrella EstrellaCrea(Imagen i, int x, int y, int w, int h) { 
    Estrella e = malloc(sizeof(struct EstrellaRep)); 
    e->i=i; 
    e->x=x; 
    e->y=y; 
    e->w=w; 
    e->h=h; 
    return e; 
 } 

And Estrella is a class with its drawing and coordinates.