Yup this happened to me as well
<?xml version="1.0" ?>
<root>
<report>
<version>2</version>
<sessionid>ee55e7526592b5364985c69</sessionid>
<type>desync</type>
<sku>ea.maxis.sims4_64.15.pc</sku>
<createtime>2023-06-25 15:52:30</createtime>
<buildsignature>Local.Unknown.Unknown.1.98.158.1020-1.300.000.163.Release</buildsignature>
<categoryid>(AS)widgets.CAS.Customizer::CatalogPanel</categoryid>
<desyncid>ee55e7526592b5364985c69</desyncid>
<systemconfig/>
<screenshot/>
<desyncdata>TypeError: Error #1009: Cannot access a property or method of a null object reference.
at widgets.CAS.Customizer::CatalogPanel/NotifyRemovedParts()
at widgets.CAS.Customizer::CASCustomizerMain/HandleRemoveSelectedParts()
at olympus.io::CommunicationObject/Dispatch()
at olympus.io::CommunicationManager/SendUIMessage()
at olympus.io::CommunicationManager/SendUIMessage()
at widgets.CAS.SimContextMenu::ContextMenuRenderer/RemoveSelectedParts()
at widgets.CAS.SimContextMenu::ContextMenuRenderer/OnBtnRemoveClick()
at scaleform.clik.controls::Button/handleMouseRelease()
rtim=159529
Client Session Time: 33.07
Num Save Errors: 0
Num Load Errors: 0
Current Game State: 0x96d01090
LoadingScreenActiveFlag: 1
Origin Version: 12,218,0,5475
Modded: True
SystemInfo: Windows 10 10.0.19045 GPU: NVIDIA GeForce RTX 3060 nvldumdx.dll 31.0.15.3598, GUID: D7B71E3E-6644-11CF-6474-3F660EC2D235
</desyncdata>
</report>
</root>