Fornite hard crashes on what seems to be corruption of a scene graph prefab with a verse component in it. Here is the log output of that which we are seeing happen A LOT..
[2026.06.17-18.00.41:904][362]LogWindows: Windows GetLastError: The operation completed successfully. (0)
[2026.06.17-18.00.42:385][409]LogProximityChat: [3cc6] Applying Mutator List Properties for Mutator [CreativeMutator_ProximityChat_C_2147482645].
[2026.06.17-18.00.42:385][409]LogFort: [9f03] Setting Proximity Chat [disabled] on the client for player [Vibin Gman]. Server changes will override this.
[2026.06.17-18.00.42:385][409]LogFort: [9f5d] Updating bLocalEnableCustomProximityChatPriorityList to [false]. IsProximityChatCustomPriorityListEnabled = [false].
[2026.06.17-18.00.42:385][409]LogFort: [9f56] Updating LocalProximityChatPriorityListProviderClass to [None]. IsProximityChatCustomPriorityListEnabled = [false].
[2026.06.17-18.00.42:385][409]LogFortHitches: HITCHHUNTER: Hitch in GameThread of 279.4 ms has been detected this frame. Number of Draw Calls this Frame: 101
[2026.06.17-18.00.42:385][409]LogThreadingWindows: Error: Runnable thread FAsyncLoadingThread crashed.
[2026.06.17-18.00.42:385][410]LogWindows: Error: === Critical error: ===
[2026.06.17-18.00.42:385][410]LogWindows: Error:
[2026.06.17-18.00.42:385][410]LogWindows: Error: Fatal error: [File:Unknown] [Line: 0]
[2026.06.17-18.00.42:385][410]LogWindows: Error: ObjectSerializationError: /a78b25ab-4414-9496-7977-2b9220070125/PlayerBasePrefab_V2 (0x8BFAF969B07144D0) /a78b25ab-4414-9496-7977-2b9220070125/PlayerBasePrefab_V2 (0x8BFAF969B07144D0) - PlayerBaseComponent /a78b25ab-4414-9496-7977-2b9220070125/PlayerBasePrefab_V2.Default__PlayerBasePrefab_V2_C:PlayerBaseComponent_0: Serial size mismatch: Expected read size 28, Actual read size 48
Please select what you are reporting on:
Unreal Editor for Fortnite
What Type of Bug are you experiencing?
Stability
Steps to Reproduce
Create a prefab and put a verse component in it that does something (no idea how to reproduce what could be in it). Work and check in and do normal things. Sooner or later this error will happen and it will crash Fortnite fully.
Expected Result
Fortnite never crashesā¦ prefab doesnāt corrupt? not sure, anything other than what is happening
Observed Result
fortnite crashes, prefab has to be completely deleted from the project and a new one created.
This has been happening in multiple of our projects a few times per day to random scene graph prefabs/components. Every time, we have to look at the logs to see which component/prefab is messed up, and then we can fix it by simply creating the same prefab/component from scratch, pasting in the code. The game will not run until we do this duplication. Additionally, these crashes persist in private codes, so public games would be crashing from this bug.
I had the same exact problem for hours last night. Had to quit because I was crashing more than I was working. Hereās a snippet from my log showing the size error on my entity / component.
Having this exact same issue and was crashing for an hour straight last night. I have always been able to stop crashing without deleting my entity. I believe the crashing stopped for me after clicking āFull recookā but that could be coincidental.
how do you click full recook if fortnite isnāt running though? Mine is greyed out after fortnite crashes and I canāt launch another session without crashing.