UI Exception 1009: UI removed, Black Screen and unresponsive game

In my latest game session on an unmodded save (investigating UI exceptions after experiencing them in modded games) I got both a Last UI Exception file and a Last Exception file. Here is the UI exception:

<?xml version="1.0" ?><root>
<report><version>2</version><sessionid>364e0566bf1ad0e5683f7d46</sessionid><type>desync</type><sku>ea.maxis.sims4_64.15.pc</sku><createtime>2025-06-04 03:24:15</createtime><buildsignature>Local.Unknown.Unknown.1.115.216.1030-1.200.000.658.Release</buildsignature><categoryid>(AS)olympus.views::CellView</categoryid><desyncid>364e0566bf1ad0e5683f7d46</desyncid><systemconfig/><screenshot/><desyncdata>TypeError: Error #1009: Cannot access a property or method of a null object reference.&#13;&#10;    at olympus.views::CellView/Draw()&#13;&#10;    at olympus.layout::GridLayout/OnFeedUpdate()&#13;&#10;    at widgets.Gameplay.SituationDisplay.controls::SituationGridViewGoalDisplay/RedrawGoalCellView()&#13;&#10;    at widgets.Gameplay.SituationDisplay.controls::SituationGridViewGoalDisplay/GoalCompleted()&#13;&#10;    at widgets.Gameplay.SituationDisplay.controls::SituationGridViewGoalDisplay/SetData()&#13;&#10;    at widgets.Gameplay.SituationDisplay.controls::HolidaySituationGoalContainer/SetGoalData()&#13;&#10;    at widgets.Gameplay.SituationDisplay.controls::SituationContentBase/HandleSituationGoalsUpdate()&#13;&#10;    at widgets.Gameplay.SituationDisplay.controls::SituationTabDisplayBase/HandleSituationGoalsUpdate()&#13;&#10;    at widgets.Gameplay.SituationDisplay::SituationDisplayMain/HandleSituationGoalsUpdate()&#13;&#10;    at olympus.io::CommunicationObject/Dispatch()&#13;&#10;    at olympus.io::CommunicationManager/SendUIMessage()&#13;&#10;rtim=1612161&#13;&#10;Client Session Time: 33.52&#13; &#10;Num Save Errors: 0&#13; &#10;Num Load Errors: 0&#13; &#10;Current Game State: 0x96d01090&#13; &#10;LoadingScreenActiveFlag: 1&#13; &#10;Origin Version: 13,477,0,5990&#13; &#10;Modded: False&#13; &#10;SystemInfo: Windows 11 10.0.26100 GPU: NVIDIA GeForce RTX 3060 Laptop GPU  32.0.15.6607, GUID: 3570AB96-EDF0-11EF-8AAF-D575D18A1133&#13; &#10;</desyncdata></report>
</root>

I will post a separate thread on the Last Exception.