### 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?)
timeline->update_play_position();
	_redraw_tracks();
	for (int i = 0; i < track_edits.size(); i++) {
		track_edits[i]->update_play_position();
	}
	_redraw_groups();
	bezier_edit->queue_redraw();
	bezier_edit->update_play_position();
}
int AnimationTrackEditor::_get_track_selected() {
	for (int i = 0; i < track_edits.size(); i++) {
		if (track_edits[i]->has_focus()) {
			return i;
		}
	}
	return -1;
}
void AnimationTrackEditor::_insert_key_from_track(float p_ofs, int p_track) {