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When trying to clean up my stage on game over, I loop through my game object groups and destroy all children inside explicitly. Then I destroy the (now empty) groups: cleanGroup(Grp1); // Grp1 is child of Stage groupcleanGroup(Grp2); // Grp2 is child of Stage groupcleanGroup(Grp3), // Grp3 is child of Stage groupcleanGroup(Stage);var cleanGroup = function(Grp) { if (Grp.children) { while (Grp.children.length) Grp.removeChildAt(0).destroy(); } Grp.destroy(); }However, this always gives me a hole bunch of error messages like: this.children is null this.parent is null o is null The error messages are constantly repeating as if it where within a loop anywhere inside the Pixi render enginge. Why is this and how could this be solved? Do I need to destroy my created sprites and groups at all or is it enough just to remove all of my references to them and let the garbage collection do the rest? Would this be reliable?