Hi, thank you so much for looking into this!
Here are the complete LastException files as requested. I have included three logs that demonstrate the chain of events:
1. The Original Ladder Error
[spoiler] <?xml version="1.0" ?><root>
<report><version>2</version><sessionid>5a12e049dc23aa1669846028</sessionid><type>desync</type><sku>ea.maxis.sims4_64.15.pc</sku><createtime>2026-02-05 20:03:55</createtime><buildsignature>Local.Unknown.Unknown.1.121.342.1030-1.200.000.692.Release</buildsignature><categoryid>build_ladders_mixin.py:91</categoryid><desyncid>5a12e049dc23aa1669846028</desyncid><systemconfig/><screenshot/><desyncdata>Exception in <function buildbuy_session_end at 0x00007FF4AFF2FB00>, args: (468958090960767119,), kwargs: {} RuntimeError('Unable to acquire ladder data for objID 468958090961684634.') (RuntimeError: Unable to acquire ladder data for objID 468958090961684634.) Traceback (most recent call last): File "T:\InGame\Gameplay\Scripts\Server\routing\__init__.py", line 1151, in c_api_navmesh_fence_callback File "T:\InGame\Gameplay\Scripts\Core\sims4\utils.py", line 183, in wrapper File "T:\InGame\Gameplay\Scripts\Server\build_buy.py", line 1194, in buildbuy_session_end File "T:\InGame\Gameplay\Scripts\Server\objects\components\__init__.py", line 98, in wrapped_method File "T:\InGame\Gameplay\Scripts\Server\routing\portals\portal_component.py", line 163, in on_buildbuy_exit File "T:\InGame\Gameplay\Scripts\Server\routing\portals\portal_component.py", line 192, in _refresh_portals File "T:\InGame\Gameplay\Scripts\Server\routing\portals\portal_component.py", line 311, in _add_portals File "T:\InGame\Gameplay\Scripts\Server\routing\portals\portal_component.py", line 330, in _add_portal_internal File "T:\InGame\Gameplay\Scripts\Server\routing\portals\portal_data.py", line 538, in get_portal_instances File "T:\InGame\Gameplay\Scripts\Server\routing\portals\portal_data_build_ladders.py", line 30, in get_portal_locations File "T:\InGame\Gameplay\Scripts\Server\routing\portals\build_ladders_mixin.py", line 100, in _get_ladder_portal_locations File "T:\InGame\Gameplay\Scripts\Server\routing\portals\build_ladders_mixin.py", line 91, in _get_blocked_alignment_flags RuntimeError: Unable to acquire ladder data for objID 468958090961684634.rtim=0 Client Session Time: 4249.23 Num Save Errors: 0 Num Load Errors: 0 Current Game State: 0xbe7da869 Game Sub-state: 0xae03c339 LoadingScreenActiveFlag: 0 Origin Version: 13,631,0,6144 Modded: False SystemInfo: Windows 11 10.0.26200 GPU: NVIDIA GeForce RTX 3060 Laptop GPU nvldumdx.dll 32.0.15.9174, GUID: D7B71E3E-6660-11CF-2550-533A0EC2ED35 </desyncdata></report>
</root> [/spoiler]
2. The Ladder Error Verified on a new save (different PC)
[spoiler]
<?xml version="1.0" ?><root>
<report><version>2</version><sessionid>fa1ed618fb98b557698479fc</sessionid><type>desync</type><sku>ea.maxis.sims4_64.15.pc</sku><createtime>2026-02-05 20:49:41</createtime><buildsignature>Local.Unknown.Unknown.1.120.140.1020-1.300.000.230.Release</buildsignature><categoryid>build_ladders_mixin.py:91</categoryid><desyncid>fa1ed618fb98b557698479fc</desyncid><systemconfig/><screenshot/><desyncdata>Exception in <function buildbuy_session_end at 0x00007FF4B1AE34D0>, args: (468958090960767119,), kwargs: {} RuntimeError('Unable to acquire ladder data for objID 468958090961684634.') (RuntimeError: Unable to acquire ladder data for objID 468958090961684634.) Traceback (most recent call last): File "T:\InGame\Gameplay\Scripts\Server\routing\__init__.py", line 1151, in c_api_navmesh_fence_callback File "T:\InGame\Gameplay\Scripts\Core\sims4\utils.py", line 183, in wrapper File "T:\InGame\Gameplay\Scripts\Server\build_buy.py", line 1179, in buildbuy_session_end File "T:\InGame\Gameplay\Scripts\Server\objects\components\__init__.py", line 98, in wrapped_method File "T:\InGame\Gameplay\Scripts\Server\routing\portals\portal_component.py", line 139, in on_buildbuy_exit File "T:\InGame\Gameplay\Scripts\Server\routing\portals\portal_component.py", line 168, in _refresh_portals File "T:\InGame\Gameplay\Scripts\Server\routing\portals\portal_component.py", line 287, in _add_portals File "T:\InGame\Gameplay\Scripts\Server\routing\portals\portal_component.py", line 306, in _add_portal_internal File "T:\InGame\Gameplay\Scripts\Server\routing\portals\portal_data.py", line 537, in get_portal_instances File "T:\InGame\Gameplay\Scripts\Server\routing\portals\portal_data_build_ladders.py", line 30, in get_portal_locations File "T:\InGame\Gameplay\Scripts\Server\routing\portals\build_ladders_mixin.py", line 100, in _get_ladder_portal_locations File "T:\InGame\Gameplay\Scripts\Server\routing\portals\build_ladders_mixin.py", line 91, in _get_blocked_alignment_flags RuntimeError: Unable to acquire ladder data for objID 468958090961684634.rtim=0 Client Session Time: 54.43 Num Save Errors: 0 Num Load Errors: 0 Current Game State: 0x96d01090 LoadingScreenActiveFlag: 1 Origin Version: 13,631,0,6144 Modded: False SystemInfo: Windows 10 10.0.19045 GPU: Intel(R) HD Graphics 4600 20.19.15.5070, GUID: BB158BB9-27D9-11EE-BE91-DFDAF3A3DE8C </desyncdata></report>
</root>
[/spoiler]
3. The resulting Zone ID Conflict
[spoiler]
<?xml version="1.0" ?><root>
<report><version>2</version><sessionid>64226f2c1e3ca3a69827ce0</sessionid><type>desync</type><sku>ea.maxis.sims4_64.15.pc</sku><createtime>2026-02-04 11:15:06</createtime><buildsignature>Local.Unknown.Unknown.1.121.342.1030-1.200.000.692.Release</buildsignature><categoryid>zone_manager.py:64</categoryid><desyncid>64226f2c1e3ca3a69827ce0</desyncid><systemconfig/><screenshot/><desyncdata>Exception in <function c_api_zone_init at 0x00007FF4A4CD4320>, args: (656406934551266924, 4034911840, 'EP03_fashionDistrict_01', <built-in method set_game_time of NoneType object at 0x000000002CC07960>), kwargs: {} RuntimeError('Attempting to set _zone_id to 656406934551266924 when its already set 613622717113175144.') (RuntimeError: Attempting to set _zone_id to 656406934551266924 when its already set 613622717113175144.) Traceback (most recent call last): File "T:\InGame\Gameplay\Scripts\Core\sims4\utils.py", line 157, in wrapper File "T:\InGame\Gameplay\Scripts\Core\sims4\utils.py", line 183, in wrapper File "T:\InGame\Gameplay\Scripts\Server\areaserver.py", line 264, in c_api_zone_init File "T:\InGame\Gameplay\Scripts\Server\zone_manager.py", line 64, in create_zone RuntimeError: Attempting to set _zone_id to 656406934551266924 when its already set 613622717113175144.rtim=0 Client Session Time: 8081.68 Num Save Errors: 0 Num Load Errors: 0 Current Game State: 0xd9016c91 LoadingScreenActiveFlag: 0 Origin Version: 13,631,0,6144 Modded: False SystemInfo: Windows 11 10.0.26200 GPU: NVIDIA GeForce RTX 3060 Laptop GPU nvldumdx.dll 32.0.15.9174, GUID: D7B71E3E-6660-11CF-2550-533A0EC2ED35 </desyncdata></report>
<report><version>2</version><sessionid>64226f2c1e3ca3a69827ce0</sessionid><type>desync</type><sku>ea.maxis.sims4_64.15.pc</sku><createtime>2026-02-04 11:15:06</createtime><buildsignature>Local.Unknown.Unknown.1.121.342.1030-1.200.000.692.Release</buildsignature><categoryid>indexed_manager.py:236</categoryid><desyncid>64226f2c1e3ca3a69827ce0</desyncid><systemconfig/><screenshot/><desyncdata>Exception in <function c_api_zone_shutdown at 0x00007FF4A4CD4710>, args: (656406934551266924, <built-in method zone_shutdown_completed of NoneType object at 0x000000002CC07960>), kwargs: {} AttributeError("'NoneType' object has no attribute 'id'") (AttributeError: 'NoneType' object has no attribute 'id') Traceback (most recent call last): File "T:\InGame\Gameplay\Scripts\Server\areaserver.py", line 130, in wrapped File "T:\InGame\Gameplay\Scripts\Server\areaserver.py", line 126, in finally_wrap File "T:\InGame\Gameplay\Scripts\Core\sims4\utils.py", line 157, in wrapper File "T:\InGame\Gameplay\Scripts\Core\sims4\utils.py", line 183, in wrapper File "T:\InGame\Gameplay\Scripts\Server\areaserver.py", line 318, in c_api_zone_shutdown File "T:\InGame\Gameplay\Scripts\Server\zone_manager.py", line 88, in remove_id File "T:\InGame\Gameplay\Scripts\Server\indexed_manager.py", line 219, in remove_id File "T:\InGame\Gameplay\Scripts\Server\indexed_manager.py", line 236, in remove AttributeError: 'NoneType' object has no attribute 'id'rtim=0 Client Session Time: 8081.68 Num Save Errors: 0 Num Load Errors: 0 Current Game State: 0xd9016c91 LoadingScreenActiveFlag: 0 Origin Version: 13,631,0,6144 Modded: False SystemInfo: Windows 11 10.0.26200 GPU: NVIDIA GeForce RTX 3060 Laptop GPU nvldumdx.dll 32.0.15.9174, GUID: D7B71E3E-6660-11CF-2550-533A0EC2ED35 </desyncdata></report>
</root> [/spoiler]