### Godot version

4.0.dev (c309de53997feff3286295fb2d71657f112a15db)

### System information

Linux, Nvidia, Vulkan

### Issue description

Editor segfaults when certain conditions are met when using the AnimationPlayer editor.

### Steps to reproduce

1. Create multiple animations, saved into a animation collection
2. Open an existing animation, then make a new empty animation
3. Change from seconds to fps, or add a new property to animate ()
4. Editor crashes

NOTE: It is slightly random and I have not found a perfect repro

### Minimal reproduction project

N/A (TBD?)
info_message->set_visible(p_show);
}
bool AnimationTrackEditor::is_key_selected(int p_track, int p_key) const {
	SelectedKey sk;
	sk.key = p_key;
	sk.track = p_track;
	return selection.has(sk);
}
bool AnimationTrackEditor::is_selection_active() const {
	return selection.size();
}
bool AnimationTrackEditor::is_snap_enabled() const {
	return snap->is_pressed() ^ Input::get_singleton()->is_key_pressed(Key::CTRL);
}
void AnimationTrackEditor::_update_tracks() {
	int selected = _get_track_selected();
	while (track_vbox->get_child_count()) {
		memdelete(track_vbox->get_child(0));
	}
	track_edits.clear();
	groups.clear();
	if (animation.is_null()) {
		return;
	}
	bool file_read_only = false;
	if (!animation->get_path().is_resource_file()) {
		int srpos = animation->get_path().find("::");
		if (srpos != -1) {