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Ensure condition failed

Every now and then when I'm changing between tabs in the editor, it locks up for a few seconds, typically when I try to right click and move around the blueprint. I then get an error in the output log:

 LogUObjectArray: Warning: Other object in slot
 LogStats: FPlatformStackWalk::StackWalkAndDump -  1.070 s
 LogOutputDevice: Error: === Handled ensure: ===
 LogOutputDevice: Error: Ensure condition failed: false [File:D:\Build\++UE4+Release-4.19+Compile\Sync\Engine\Source\Editor\UnrealEd\Private\Kismet2\KismetDebugUtilities.cpp] [Line: 1108]
 LogOutputDevice: Error: Error: Invalid (but non-null) property associated with pin; cannot get variable value
 LogOutputDevice: Error: Stack: 
 LogOutputDevice: Error: [Callstack] 0x00000000DCF1B6F6 UE4Editor-Core.dll!UnknownFunction []
 LogOutputDevice: Error: [Callstack] 0x00000000DCC7AE2A UE4Editor-Core.dll!UnknownFunction []
 LogOutputDevice: Error: [Callstack] 0x00000000DCC8ECC6 UE4Editor-Core.dll!UnknownFunction []
 LogOutputDevice: Error: [Callstack] 0x00000000D12E3DF6 UE4Editor-UnrealEd.dll!UnknownFunction []
 LogOutputDevice: Error: [Callstack] 0x00000000CD40B2A8 UE4Editor-BlueprintGraph.dll!UnknownFunction []
 LogOutputDevice: Error: [Callstack] 0x00000000D048C22A UE4Editor-GraphEditor.dll!UnknownFunction []
 LogOutputDevice: Error: [Callstack] 0x00000000D03177AC UE4Editor-GraphEditor.dll!UnknownFunction []
 LogOutputDevice: Error: [Callstack] 0x00000000D031AEC9 UE4Editor-GraphEditor.dll!UnknownFunction []
 LogOutputDevice: Error: [Callstack] 0x00000000D0456E65 UE4Editor-GraphEditor.dll!UnknownFunction []
 LogOutputDevice: Error: [Callstack] 0x00000000E0B86057 UE4Editor-Slate.dll!UnknownFunction []
 LogOutputDevice: Error: [Callstack] 0x00000000E0B8BB51 UE4Editor-Slate.dll!UnknownFunction []
 LogOutputDevice: Error: [Callstack] 0x00000000E0DBC253 UE4Editor-Slate.dll!UnknownFunction []
 LogOutputDevice: Error: [Callstack] 0x00000000E0BE0475 UE4Editor-Slate.dll!UnknownFunction []
 LogOutputDevice: Error: [Callstack] 0x00000000E0BB8360 UE4Editor-Slate.dll!UnknownFunction []
 LogOutputDevice: Error: [Callstack] 0x00000000E0BAB197 UE4Editor-Slate.dll!UnknownFunction []
 LogOutputDevice: Error: [Callstack] 0x00000000E3D8E4EE UE4Editor-ApplicationCore.dll!UnknownFunction []
 LogOutputDevice: Error: [Callstack] 0x00000000E3D81B78 UE4Editor-ApplicationCore.dll!UnknownFunction []
 LogOutputDevice: Error: [Callstack] 0x00000000E3D9052C UE4Editor-ApplicationCore.dll!UnknownFunction []
 LogOutputDevice: Error: [Callstack] 0x00000000E3D7D679 UE4Editor-ApplicationCore.dll!UnknownFunction []
 LogOutputDevice: Error: [Callstack] 0x0000000077639BD1 USER32.dll!UnknownFunction []
 LogOutputDevice: Error: [Callstack] 0x00000000776398DA USER32.dll!UnknownFunction []
 LogOutputDevice: Error: [Callstack] 0x00000000E3D91666 UE4Editor-ApplicationCore.dll!UnknownFunction []
 LogOutputDevice: Error: [Callstack] 0x000000003F5D5475 UE4Editor.exe!UnknownFunction []
 LogOutputDevice: Error: [Callstack] 0x000000003F5E6BD0 UE4Editor.exe!UnknownFunction []
 LogOutputDevice: Error: [Callstack] 0x000000003F5E6C4A UE4Editor.exe!UnknownFunction []
 LogOutputDevice: Error: [Callstack] 0x000000003F5F4149 UE4Editor.exe!UnknownFunction []
 LogOutputDevice: Error: [Callstack] 0x000000003F5F5B57 UE4Editor.exe!UnknownFunction []
 LogOutputDevice: Error: [Callstack] 0x000000007751652D kernel32.dll!UnknownFunction []
 LogOutputDevice: Error: [Callstack] 0x0000000077C0C541 ntdll.dll!UnknownFunction []
 LogStats:                SubmitErrorReport -  0.000 s
 LogStats:                    SendNewReport -  6.493 s
 LogStats:             FDebug::EnsureFailed -  7.599 s
 LogUObjectArray: Warning: Other object in slot

After it prints the error to the log the editor goes back to normal. Hasnt yet crashed the whole editor, but sometimes it sure feels like its going to! Or worse, corrupt something. I've seen this error happen for a few versions now. Including the crash dump/log link text Also seems I'm not alone in this. https://answers.unrealengine.com/questions/567388/strange-log-error-when-using-the-engine.html

Product Version: UE 4.19
crashlogapr23.zip (97.9 kB)
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asked Apr 23 '18 at 04:34 PM in Bug Reports

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81 10 17 27

avatar image Shadowriver Apr 24 '18 at 07:16 PM

It seems like corruption or potentially a bug, looking on error and the code this means one of properties information in reflection is missing in memory. What class of blueprint you operate, does with appens in only this blueprint or specific class of blueprint? Do you with C++? do you hot reload? this kind of reflection system errors are usually related to hot reloading which not always work properly. Do you use any plugins and such?

If you can reproduce the issue by doing things step by step then this si something work bug reporting, even if it's hot reload issue.

avatar image Interitus384 Apr 24 '18 at 07:22 PM

Its happened only a half dozen times over the last few months, and i dont keep good track of it... But I think this last time I had gone into a player character or player controller blueprint..

No C++, no hot reloads. No non-standard plugins.

avatar image Shadowriver Apr 24 '18 at 07:50 PM

Did you did any UE4 updates with that project?

avatar image Interitus384 Apr 24 '18 at 07:54 PM

Current project I believe hasnt gone thru any updates, its still a pretty new project.

avatar image Jeff A ♦♦ STAFF Apr 24 '18 at 09:20 PM


We've recently made a switch to a new bug reporting method using a more structured form. Please visit the link below for more details and report the issue using the new Bug Submission Form. Feel free to continue to use this thread for community discussion around the issue.



avatar image Interitus384 Apr 25 '18 at 12:26 AM

Unfortunately I cant provide more detail than what I've got above. It only happens occasionally, and I dont know how to reproduce it.

avatar image rit May 14 '18 at 04:09 AM


I encounter this issue 2 times in my character animation blueprint class.

I'm using 4.16.1, c++ code, (but didn't hot reload when this bug appear), no plug-in

I cannot reproduce this bug. It seems to randomly occur when I open my animation blueprint.

avatar image mhnoni Feb 17 '19 at 10:59 PM

I'm having same problem with 4.22 this only happened after i moved from 4.15. same as op said it happens randomly so its hard to find it.

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