@CMeki
Thanks for the help. I reset my game using what you said and it worked fine, until now.
I am experiencing the same issues as yesterday with the same household. This time not when loading into the game but when travelling back to my home after a social event that the game cancelled somehow while I was there. I guess resetting the game again would fix this, but since it has happened twice in 24 hours now, there should be a more permanent fix to this issue than just keep resetting the game which is quite time consuming.
Edit: Closing the game and reloading the save file seems to work just fine as well. (Latest save is from 1 hour before the crash) I checked my Sims 4 folder and a last exception file was created at the time of the crash. I can't seem to add it to this message so I copied it here:
<?xml version="1.0" ?><root>
<report><version>2</version><sessionid>d32add1453a2fd0f5a51e8a0</sessionid><type>desync</type><sku>ea.maxis.sims4_64.15.pc</sku><createtime>2018-01-07 15:33:34</createtime><buildsignature>Local.Unknown.Unknown.1.37.35.1010-1.300.000.106.Release</buildsignature><categoryid>log.py:833</categoryid><desyncid>d32add1453a2fd0f5a51e8a0</desyncid><systemconfig/><screenshot/><desyncdata>[tingyul] Exception thrown while loading an object in an inventory. Object: object_collectible_painting_Microscope_2x1x1_01:0x0534059c8ae601cb Owner: (AssertionError: [Object Manager] [tingyul] Attempting to move an object that is not in this manager) Traceback (most recent call last): File "T:\InGame\Gameplay\Scripts\Server\areaserver.py", line 111, in wrapped File "T:\InGame\Gameplay\Scripts\Server\areaserver.py", line 107, in finally_wrap File "T:\InGame\Gameplay\Scripts\Core\sims4\utils.py", line 173, in wrapper File "T:\InGame\Gameplay\Scripts\Core\sims4\utils.py", line 191, in wrapper File "T:\InGame\Gameplay\Scripts\Server\areaserver.py", line 347, in c_api_client_connect File "T:\InGame\Gameplay\Scripts\Server\zone.py", line 514, in do_zone_spin_up File "T:\InGame\Gameplay\Scripts\Server\zone_spin_up_service.py", line 1178, in update File "T:\InGame\Gameplay\Scripts\Server\zone_spin_up_service.py", line 554, in on_enter File "T:\InGame\Gameplay\Scripts\Server\sims\sim_spawner_service.py", line 619, in batch_spawn_during_zone_spin_up File "T:\InGame\Gameplay\Scripts\Server\sims\sim_spawner_service.py", line 788, in _spawn_next_sim File "T:\InGame\Gameplay\Scripts\Server\sims\sim_spawner_service.py", line 821, in _spawn_requested_sim File "T:\InGame\Gameplay\Scripts\Server\sims\sim_spawner.py", line 409, in spawn_sim File "T:\InGame\Gameplay\Scripts\Server\sims\sim_info.py", line 1663, in create_sim_instance File "T:\InGame\Gameplay\Scripts\Server\objects\system.py", line 178, in create_object File "T:\InGame\Gameplay\Scripts\Server\objects\object_manager.py", line 497, in add File "T:\InGame\Gameplay\Scripts\Server\indexed_manager.py", line 165, in add File "T:\InGame\Gameplay\Scripts\Server\objects\object_manager.py", line 83, in call_on_add File "T:\InGame\Gameplay\Scripts\Server\indexed_manager.py", line 280, in call_on_add File "T:\InGame\Gameplay\Scripts\Server\sims\sim.py", line 2326, in on_add File "T:\InGame\Gameplay\Scripts\Server\objects\components\inventory.py", line 645, in load_items File "T:\InGame\Gameplay\Scripts\Server\objects\components\sim_inventory_component.py", line 113, in _load_item File "T:\InGame\Gameplay\Scripts\Server\objects\components\inventory.py", line 655, in _create_inventory_object File "T:\InGame\Gameplay\Scripts\Server\objects\system.py", line 186, in create_object File "T:\InGame\Gameplay\Scripts\Server\objects\components\inventory.py", line 655, in <lambda> File "T:\InGame\Gameplay\Scripts\Server\objects\components\inventory.py", line 663, in _post_create_object File "T:\InGame\Gameplay\Scripts\Server\objects\game_object.py", line 943, in load_object File "T:\InGame\Gameplay\Scripts\Server\objects\script_object.py", line 1618, in load_object File "T:\InGame\Gameplay\Scripts\Server\objects\script_object.py", line 1701, in load File "T:\InGame\Gameplay\Scripts\Server\objects\components\inventory_item.py", line 748, in load File "T:\InGame\Gameplay\Scripts\Server\objects\components\inventory.py", line 313, in add_from_load File "T:\InGame\Gameplay\Scripts\Server\objects\components\inventory.py", line 329, in _insert_item File "T:\InGame\Gameplay\Scripts\Server\objects\components\inventory_storage.py", line 169, in insert File "T:\InGame\Gameplay\Scripts\Server\objects\components\inventory_storage.py", line 272, in _insert File "T:\InGame\Gameplay\Scripts\Server\objects\object_manager.py", line 486, in move_to_inventory File "T:\InGame\Gameplay\Scripts\Core\sims4\log.py", line 833, in assert_raise AssertionError: [Object Manager] [tingyul] Attempting to move an object that is not in this manager </desyncdata></report>
</root>