C++ is Virtual destructor still needed if there are no data members in derived?

Suppose I have this code

class Base{
  public:
        int getVal();
  private:
         int a, b;
};

class Derived::public Base{
    public:
         void printVal();
};

int main(){
    Base *b = new Derived();
    delete b;    
}

I know a virtual destructor would delete things properly, but is it bad to delete with base pointer (when there is no virtual destructor) even if there are no virtual functions and no data members in the derived class? What will happen if this is done?