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Finally managed to solve the issue myself.

The issue was with the pointer usage of the Octree created inside the callback. It needed to be deleted but since i passed it to the "evaluatorObject" by pointer i was not sure where i had to delete it. (inside object or inside callback). Because of this, i decided to use smart pointers. "std::shared_ptr" to be exact.

i changed the callback from

void mapCallback(const octomap_msgs::Octomap::ConstPtr &msg)
{
    octomap::AbstractOcTree* tree = octomap_msgs::msgToMap(*msg);
    octomap::OcTree* tree_oct = dynamic_cast<octomap::OcTree*>(tree);
    evaluatorObject.update_tree(tree_oct);
}

to

void mapCallback(const octomap_msgs::Octomap::ConstPtr &msg)
{
    std::shared_ptr<octomap::OcTree> tree = std::shared_ptr<octomap::OcTree> (dynamic_cast<octomap::OcTree*> (octomap_msgs::msgToMap(*msg)));
    evaluatorObject.update_tree(tree);

}

and it solved the issue.

Finally managed to solve the issue myself.

The issue was with the pointer usage of the Octree created inside the callback. It needed to be deleted but since i passed it to the "evaluatorObject" by pointer i was not sure where i had to delete it. (inside object or inside callback). Because of this, i decided to use smart pointers. "std::shared_ptr" to be exact.

i changed the callback from

void mapCallback(const octomap_msgs::Octomap::ConstPtr &msg)
{
    octomap::AbstractOcTree* tree = octomap_msgs::msgToMap(*msg);
    octomap::OcTree* tree_oct = dynamic_cast<octomap::OcTree*>(tree);
    evaluatorObject.update_tree(tree_oct);
}

to

void mapCallback(const octomap_msgs::Octomap::ConstPtr &msg)
{
    std::shared_ptr<octomap::OcTree> tree = std::shared_ptr<octomap::OcTree> (dynamic_cast<octomap::OcTree*> (octomap_msgs::msgToMap(*msg)));
    evaluatorObject.update_tree(tree);
 }

and it solved the issue.