This exception keeps getting thrown when a song is selected. It doesn't appear to break anything, but needs to be fixed. Definitely related to the Gameplay settings menu. For some reason a destroyed GameObject is being accessed.
[CRITICAL @ 22:11:19 | UnityEngine] NullReferenceException
[CRITICAL @ 22:11:19 | UnityEngine] UnityEngine.RectTransform.get_sizeDelta () (at <97fdf0a75ab94da9a7e5188c186e574d>:0)
[CRITICAL @ 22:11:19 | UnityEngine] UnityEngine.UI.HorizontalOrVerticalLayoutGroup.GetChildSizes (UnityEngine.RectTransform child, System.Int32 axis, System.Boolean controlSize, System.Boolean childForceExpand, System.Single& min, System.Single& preferred, System.Single& flexible) (at <bb86d7036fba4b379d7e56f853ff7d90>:0)
[CRITICAL @ 22:11:19 | UnityEngine] UnityEngine.UI.HorizontalOrVerticalLayoutGroup.SetChildrenAlongAxis (System.Int32 axis, System.Boolean isVertical) (at <bb86d7036fba4b379d7e56f853ff7d90>:0)
[CRITICAL @ 22:11:19 | UnityEngine] UnityEngine.UI.HorizontalLayoutGroup.SetLayoutHorizontal () (at <bb86d7036fba4b379d7e56f853ff7d90>:0)
[CRITICAL @ 22:11:19 | UnityEngine] UnityEngine.UI.LayoutRebuilder+<>c.<Rebuild>b__12_1 (UnityEngine.Component e) (at <bb86d7036fba4b379d7e56f853ff7d90>:0)
[CRITICAL @ 22:11:19 | UnityEngine] UnityEngine.UI.LayoutRebuilder.PerformLayoutControl (UnityEngine.RectTransform rect, UnityEngine.Events.UnityAction`1[T0] action) (at <bb86d7036fba4b379d7e56f853ff7d90>:0)
[CRITICAL @ 22:11:19 | UnityEngine] UnityEngine.UI.LayoutRebuilder.PerformLayoutControl (UnityEngine.RectTransform rect, UnityEngine.Events.UnityAction`1[T0] action) (at <bb86d7036fba4b379d7e56f853ff7d90>:0)
[CRITICAL @ 22:11:19 | UnityEngine] UnityEngine.UI.LayoutRebuilder.PerformLayoutControl (UnityEngine.RectTransform rect, UnityEngine.Events.UnityAction`1[T0] action) (at <bb86d7036fba4b379d7e56f853ff7d90>:0)
[CRITICAL @ 22:11:19 | UnityEngine] UnityEngine.UI.LayoutRebuilder.Rebuild (UnityEngine.UI.CanvasUpdate executing) (at <bb86d7036fba4b379d7e56f853ff7d90>:0)
[CRITICAL @ 22:11:19 | UnityEngine] UnityEngine.UI.CanvasUpdateRegistry.PerformUpdate () (at <bb86d7036fba4b379d7e56f853ff7d90>:0)
[CRITICAL @ 22:11:19 | UnityEngine] UnityEngine.Canvas:SendWillRenderCanvases()
[CRITICAL @ 22:11:19 | UnityEngine] NullReferenceException
[CRITICAL @ 22:11:19 | UnityEngine] UnityEngine.RectTransform.get_sizeDelta () (at <97fdf0a75ab94da9a7e5188c186e574d>:0)
[CRITICAL @ 22:11:19 | UnityEngine] UnityEngine.UI.HorizontalOrVerticalLayoutGroup.GetChildSizes (UnityEngine.RectTransform child, System.Int32 axis, System.Boolean controlSize, System.Boolean childForceExpand, System.Single& min, System.Single& preferred, System.Single& flexible) (at <bb86d7036fba4b379d7e56f853ff7d90>:0)
[CRITICAL @ 22:11:19 | UnityEngine] UnityEngine.UI.HorizontalOrVerticalLayoutGroup.SetChildrenAlongAxis (System.Int32 axis, System.Boolean isVertical) (at <bb86d7036fba4b379d7e56f853ff7d90>:0)
[CRITICAL @ 22:11:19 | UnityEngine] UnityEngine.UI.HorizontalLayoutGroup.SetLayoutHorizontal () (at <bb86d7036fba4b379d7e56f853ff7d90>:0)
[CRITICAL @ 22:11:19 | UnityEngine] UnityEngine.UI.LayoutRebuilder+<>c.<Rebuild>b__12_1 (UnityEngine.Component e) (at <bb86d7036fba4b379d7e56f853ff7d90>:0)
[CRITICAL @ 22:11:19 | UnityEngine] UnityEngine.UI.LayoutRebuilder.PerformLayoutControl (UnityEngine.RectTransform rect, UnityEngine.Events.UnityAction`1[T0] action) (at <bb86d7036fba4b379d7e56f853ff7d90>:0)
[CRITICAL @ 22:11:19 | UnityEngine] UnityEngine.UI.LayoutRebuilder.PerformLayoutControl (UnityEngine.RectTransform rect, UnityEngine.Events.UnityAction`1[T0] action) (at <bb86d7036fba4b379d7e56f853ff7d90>:0)
[CRITICAL @ 22:11:19 | UnityEngine] UnityEngine.UI.LayoutRebuilder.Rebuild (UnityEngine.UI.CanvasUpdate executing) (at <bb86d7036fba4b379d7e56f853ff7d90>:0)
[CRITICAL @ 22:11:19 | UnityEngine] UnityEngine.UI.CanvasUpdateRegistry.PerformUpdate () (at <bb86d7036fba4b379d7e56f853ff7d90>:0)
[CRITICAL @ 22:11:19 | UnityEngine] UnityEngine.Canvas:SendWillRenderCanvases()