# UEFN island crash when PutInStasis is called on a fort character spawned from an NPC spawner device - 39.00 **URL:** \ **Category:** Issues and Bug Reporting\ **Tags:** closed, fortnite-creative, unreal-editor-for-fortnite, fortnite\ **Created:** [December 1, 2025, 8:19pm UTC](https://forums.unrealengine.com/t/uefn-island-crash-when-putinstasis-is-called-on-a-fort-character-spawned-from-an-npc-spawner-device-39-00/2680976 "2025-12-01T20:19:50Z")\ **Posts on this page:** 14\ **Page:** 1
**Author:** ![IGS\_Cbowman](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@IGS\_Cbowman](https://forums.unrealengine.com/u/IGS_Cbowman)\ **Post date:** [December 1, 2025, 8:19pm UTC](https://forums.unrealengine.com/t/uefn-island-crash-when-putinstasis-is-called-on-a-fort-character-spawned-from-an-npc-spawner-device-39-00/2680976/1 "2025-12-01T20:19:50Z")
### Summary Hey all, I have noticed with the update to 39.00, our UEFN builds now crash whenever a call to put the fort\_character of a NPC spawned from the npc\_spawner\_device into stasis is made (PutInStasis). This was working with 38.10 with the call causing the NPC to stop moving until a subsequent ReleaseFromStasis is called. As of 39.00, calling PutInStasis causes the game to freeze for about 20 seconds before the game ultimately crashes. Any help with the matter would be greatly appreciated as our game heavily relies on this functionality. ### Please select what you are reporting on: Unreal Editor for Fortnite ### What Type of Bug are you experiencing? AI ### Steps to Reproduce - Spawn an NPC from a npc\_spawner\_device - Get reference to the NPCs fort\_character - Call PutInStasis() on the fort\_character ### Expected Result NPC stops moving until a subsequent ReleaseFromStasis is called ### Observed Result the game freezes for about 20 seconds before the game ultimately crashes ### Platform(s) Windows ---
**Author:** ![Flak](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/flak/32/769441_2.png) [@Flak](https://forums.unrealengine.com/u/Flak)\ **Post date:** [December 1, 2025, 9:55pm UTC](https://forums.unrealengine.com/t/uefn-island-crash-when-putinstasis-is-called-on-a-fort-character-spawned-from-an-npc-spawner-device-39-00/2680976/3 "2025-12-01T21:55:16Z")
Thank you, we’ll get someone to take a look. ---
**Author:** ![Breast](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/breast/32/1186996_2.png) [@Breast](https://forums.unrealengine.com/u/Breast)\ **Post date:** [December 2, 2025, 10:29pm UTC](https://forums.unrealengine.com/t/uefn-island-crash-when-putinstasis-is-called-on-a-fort-character-spawned-from-an-npc-spawner-device-39-00/2680976/5 "2025-12-02T22:29:36Z")
Articulated perfectly! Awesome! Thank u for diagnosing this! ---
**Author:** ![Flak](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/flak/32/769441_2.png) [@Flak](https://forums.unrealengine.com/u/Flak)\ **Post date:** [December 3, 2025, 12:34am UTC](https://forums.unrealengine.com/t/uefn-island-crash-when-putinstasis-is-called-on-a-fort-character-spawned-from-an-npc-spawner-device-39-00/2680976/6 "2025-12-03T00:34:18Z")
@IGS_Cbowman Could we get your UEFN logs so we can investigate? > [@How to get your Fortnite logs](https://forums.unrealengine.com/t/how-to-get-your-fortnite-logs/682382): > > At times, we will ask you to send us your logs when you’re having an issue in UEFN. Here is how to do that: UEFN Logs Exit Fortnite. Click on Start or press the Windows Key + R. Type \AppData\Local\UnrealEditorFortnite\Saved\Logs and press Enter. Zip your Logs folder and attach the zip file to your reply. To find UEFN Logs while working in UEFN: Click “Output Log” at the bottom of the window. Click on “Setting” at the top right of the window Click “Open Source Location” Zip your Logs folder… ---
**Author:** ![OvalProjects](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@OvalProjects](https://forums.unrealengine.com/u/OvalProjects)\ **Post date:** [December 3, 2025, 12:35am UTC](https://forums.unrealengine.com/t/uefn-island-crash-when-putinstasis-is-called-on-a-fort-character-spawned-from-an-npc-spawner-device-39-00/2680976/7 "2025-12-03T00:35:54Z")
Can you respond to the cook errors in UEFN, please? ---
**Author:** ![IGS\_Cbowman](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@IGS\_Cbowman](https://forums.unrealengine.com/u/IGS_Cbowman)\ **Post date:** [December 3, 2025, 4:39pm UTC](https://forums.unrealengine.com/t/uefn-island-crash-when-putinstasis-is-called-on-a-fort-character-spawned-from-an-npc-spawner-device-39-00/2680976/8 "2025-12-03T16:39:22Z")
@Flak For sure! I have logs I just produced, but when I try to upload the zipped folder here it is saying “Sorry, new users can not upload attachments“. How should I go about handing the zip over? ---
**Author:** ![IGS\_Cbowman](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@IGS\_Cbowman](https://forums.unrealengine.com/u/IGS_Cbowman)\ **Post date:** [December 3, 2025, 4:47pm UTC](https://forums.unrealengine.com/t/uefn-island-crash-when-putinstasis-is-called-on-a-fort-character-spawned-from-an-npc-spawner-device-39-00/2680976/9 "2025-12-03T16:47:28Z")
[Logs.zip](https://forums.unrealengine.com/uploads/short-url/q9wWbYKIpYyceIzJ2jc3CuXszfg.zip) (362.1 KB) ---
**Author:** ![IGS\_Cbowman](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@IGS\_Cbowman](https://forums.unrealengine.com/u/IGS_Cbowman)\ **Post date:** [December 3, 2025, 5:01pm UTC](https://forums.unrealengine.com/t/uefn-island-crash-when-putinstasis-is-called-on-a-fort-character-spawned-from-an-npc-spawner-device-39-00/2680976/10 "2025-12-03T17:01:07Z")
May be worth mentioning that the session disconnects immediately once the issue occurs, leaving the island frozen for around 30 seconds before it boots the session back to lobby with a “Network Error“. ---
**Author:** ![IGS\_Cbowman](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@IGS\_Cbowman](https://forums.unrealengine.com/u/IGS_Cbowman)\ **Post date:** [December 3, 2025, 7:49pm UTC](https://forums.unrealengine.com/t/uefn-island-crash-when-putinstasis-is-called-on-a-fort-character-spawned-from-an-npc-spawner-device-39-00/2680976/11 "2025-12-03T19:49:13Z")
To Update this thread, I have found the root issue to be calling PutInStasis while you are actively using the NavigateTo function. Better repo steps would be as followed: - Create an island with an npc\_spawner (I used a test NPC char def with the only change the type being a guard) - Create a new verse device with the following sample code (you can use any navigation method, this is just the one I wrote up to test) - Add the device to the world - Add the npc\_spawner reference to the device - Add a few props to use for navigation points (can just use one far away) - run the game and watch that the game freezes when stasis is called I think the only thing that is for sure needed for this to happen is calling PutInStasis while the NPC is navigating. Hope this helps! ---
**Author:** ![Ga.th](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/ga.th/32/1087639_2.png) [@Ga.th](https://forums.unrealengine.com/u/Ga.th)\ **Post date:** [December 5, 2025, 8:13pm UTC](https://forums.unrealengine.com/t/uefn-island-crash-when-putinstasis-is-called-on-a-fort-character-spawned-from-an-npc-spawner-device-39-00/2680976/12 "2025-12-05T20:13:31Z")
I tried using a `Sleep(0.0)` before calling `PutInStasis`, and that made it work correctly. ---
**Author:** ![IGS\_Cbowman](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@IGS\_Cbowman](https://forums.unrealengine.com/u/IGS_Cbowman)\ **Post date:** [December 8, 2025, 4:19pm UTC](https://forums.unrealengine.com/t/uefn-island-crash-when-putinstasis-is-called-on-a-fort-character-spawned-from-an-npc-spawner-device-39-00/2680976/13 "2025-12-08T16:19:41Z")
@Ga.th I am not sure the context of what you are applying the PutInStasis to the NPC, but for my context (seen in my previous post) launching the stasis call on a separate thread does not do anything. ![image](https://d3kjluh73b9h9o.cloudfront.net/original/4X/b/6/6/b66bce645b592c8fbe22cd69c70e6a6a09ad3644.png) (This code does not work) The problem appears to only happen when the “NavigateTo“ function is being ran on a thread while PutInStasis is called. ![image](https://d3kjluh73b9h9o.cloudfront.net/original/4X/f/8/8/f889c94c6fd1597bdfb8df8f85cc1c2d0b119b44.png) You may be calling PutInStasis while the character is not navigating which I can confirm does work fine. ---
**Author:** ![Ga.th](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/ga.th/32/1087639_2.png) [@Ga.th](https://forums.unrealengine.com/u/Ga.th)\ **Post date:** [December 8, 2025, 10:04pm UTC](https://forums.unrealengine.com/t/uefn-island-crash-when-putinstasis-is-called-on-a-fort-character-spawned-from-an-npc-spawner-device-39-00/2680976/14 "2025-12-08T22:04:21Z")
Yes, I did some more tests with `Sleep(0.0)` and it really doesn’t work. I’m applying the effect to test players, who were most likely standing still when I tested it. Thanks for the reply. ---
**Author:** ![Bug-Reporter](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/bug-reporter/32/997076_2.png) [@Bug-Reporter](https://forums.unrealengine.com/u/Bug-Reporter)\ **Post date:** [March 30, 2026, 2:03pm UTC](https://forums.unrealengine.com/t/uefn-island-crash-when-putinstasis-is-called-on-a-fort-character-spawned-from-an-npc-spawner-device-39-00/2680976/16 "2026-03-30T14:03:04Z")
FORT-1026345 has been ‘Closed’. We’re unable to reproduce this issue. ---
**Author:** ![system](https://d3kjluh73b9h9o.cloudfront.net/original/4X/7/1/3/713c9d3f58553f0de89543d76a8a3a2779dc9fa4.png) [@system](https://forums.unrealengine.com/u/system)\ **Post date:** [May 30, 2026, 8:20pm UTC](https://forums.unrealengine.com/t/uefn-island-crash-when-putinstasis-is-called-on-a-fort-character-spawned-from-an-npc-spawner-device-39-00/2680976/17 "2026-05-30T20:20:05Z")
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