Engine Version: 5.7.4 (did not occur in 5.6.1)
Platform: Windows 10
Build Configuration: Development (packaged)
Description:
After upgrading from UE 5.6.1 to 5.7.4, our game intermittently crashes during gameplay with the following assertion:
Assertion failed: ComponentsToUpdate.IsValidIndex(ArrayIndex) [File: D:\build\++UE5\Sync\Engine\Source\Runtime\Engine\Private\LevelTick.cpp] [Line: 986]
The crash has zero Blueprint frames in the script stack, confirming no user code is involved. The callstack is identical across multiple crash instances. The crash occurs after varying amounts of gameplay time and is not consistently triggered by any specific player action.
The crash only occurs in packaged builds — it does not occur in PIE.
Callstack:
Script Stack (0 frames) :
[2026.03.29-19.28.28:284][ 61]LogWindows: Error: appError called: Assertion failed: ComponentsToUpdate.IsValidIndex(ArrayIndex) [File:D:\build++UE5\Sync\Engine\Source\Runtime\Engine\Private\LevelTick.cpp] [Line: 986]
[2026.03.29-19.28.28:284][ 61]LogWindows: Windows GetLastError: The operation completed successfully. (0)
[2026.03.29-19.28.37:920][ 61]LogWindows: Could not start crash report client using ../../../Engine/Binaries/Win64/CrashReportClient-Win64-Debug.exe
[2026.03.29-19.28.37:920][ 61]LogMemory: Platform Memory Stats for Windows
[2026.03.29-19.28.37:920][ 61]LogMemory: Process Physical Memory: 3469.25 MB used, 6870.67 MB peak
[2026.03.29-19.28.37:920][ 61]LogMemory: Process Virtual Memory: 13638.61 MB used, 13660.38 MB peak
[2026.03.29-19.28.37:920][ 61]LogMemory: Physical Memory: 14894.30 MB used, 83352.31 MB free, 98246.61 MB total
[2026.03.29-19.28.37:920][ 61]LogMemory: Virtual Memory: 38869.87 MB used, 204513.81 MB free, 243383.69 MB total
[2026.03.29-19.28.37:920][ 61]Message dialog closed, result: Ok, title: The UE-MTDDA_260326 Game has crashed and will close, text: Assertion failed: ComponentsToUpdate.IsValidIndex(ArrayIndex) [File:D:\build++UE5\Sync\Engine\Source\Runtime\Engine\Private\LevelTick.cpp] [Line: 986]
[2026.03.29-19.28.37:920][ 61]LogWindows: Error: === Critical error: ===
[2026.03.29-19.28.37:920][ 61]LogWindows: Error:
[2026.03.29-19.28.37:920][ 61]LogWindows: Error: Assertion failed: ComponentsToUpdate.IsValidIndex(ArrayIndex) [File:D:\build++UE5\Sync\Engine\Source\Runtime\Engine\Private\LevelTick.cpp] [Line: 986]
[2026.03.29-19.28.37:920][ 61]LogWindows: Error:
[2026.03.29-19.28.37:920][ 61]LogWindows: Error:
[2026.03.29-19.28.37:920][ 61]LogWindows: Error:
[2026.03.29-19.28.37:920][ 61]LogWindows: Error: [Callstack] 0x00007ff62d500588 MTDDA_260326.exe!UnknownFunction
[2026.03.29-19.28.37:920][ 61]LogWindows: Error: [Callstack] 0x00007ff633bbed46 MTDDA_260326.exe!UnknownFunction
[2026.03.29-19.28.37:920][ 61]LogWindows: Error: [Callstack] 0x00007ff63353e679 MTDDA_260326.exe!UnknownFunction
[2026.03.29-19.28.37:920][ 61]LogWindows: Error: [Callstack] 0x00007ff6335c1c08 MTDDA_260326.exe!UnknownFunction
[2026.03.29-19.28.37:920][ 61]LogWindows: Error: [Callstack] 0x00007ff6335c94e6 MTDDA_260326.exe!UnknownFunction
[2026.03.29-19.28.37:920][ 61]LogWindows: Error: [Callstack] 0x00007ff62d1984c4 MTDDA_260326.exe!UnknownFunction
[2026.03.29-19.28.37:920][ 61]LogWindows: Error: [Callstack] 0x00007ff62d18c6e8 MTDDA_260326.exe!UnknownFunction
[2026.03.29-19.28.37:920][ 61]LogWindows: Error: [Callstack] 0x00007ff62d18cb9e MTDDA_260326.exe!UnknownFunction
[2026.03.29-19.28.37:920][ 61]LogWindows: Error: [Callstack] 0x00007ff62d19afd4 MTDDA_260326.exe!UnknownFunction
[2026.03.29-19.28.37:920][ 61]LogWindows: Error: [Callstack] 0x00007ff62d19b51d MTDDA_260326.exe!UnknownFunction
[2026.03.29-19.28.37:920][ 61]LogWindows: Error: [Callstack] 0x00007ff62d89402f MTDDA_260326.exe!UnknownFunction
[2026.03.29-19.28.37:920][ 61]LogWindows: Error: [Callstack] 0x00007ff63364e99e MTDDA_260326.exe!UnknownFunction
[2026.03.29-19.28.37:920][ 61]LogWindows: Error: [Callstack] 0x00007ff633bcbf1f MTDDA_260326.exe!UnknownFunction
[2026.03.29-19.28.37:921][ 61]LogWindows: Error: [Callstack] 0x00007ff633bcb72c MTDDA_260326.exe!UnknownFunction
[2026.03.29-19.28.37:921][ 61]LogWindows: Error: [Callstack] 0x00007ff6311dcf19 MTDDA_260326.exe!UnknownFunction
[2026.03.29-19.28.37:921][ 61]LogWindows: Error: [Callstack] 0x00007ff6311ddfc0 MTDDA_260326.exe!UnknownFunction
[2026.03.29-19.28.37:921][ 61]LogWindows: Error: [Callstack] 0x00007ff633948548 MTDDA_260326.exe!UnknownFunction
[2026.03.29-19.28.37:921][ 61]LogWindows: Error: [Callstack] 0x00007ff63462699b MTDDA_260326.exe!UnknownFunction
[2026.03.29-19.28.37:921][ 61]LogWindows: Error: [Callstack] 0x00007ff6338f7c8d MTDDA_260326.exe!UnknownFunction
[2026.03.29-19.28.37:921][ 61]LogWindows: Error: [Callstack] 0x00007ff633904443 MTDDA_260326.exe!UnknownFunction
[2026.03.29-19.28.37:921][ 61]LogWindows: Error: [Callstack] 0x00007ff634a8d78c MTDDA_260326.exe!UnknownFunction
[2026.03.29-19.28.37:921][ 61]LogWindows: Error: [Callstack] 0x00007ff634a9b5bd MTDDA_260326.exe!UnknownFunction
[2026.03.29-19.28.37:921][ 61]LogWindows: Error: [Callstack] 0x00007ff634a9b6aa MTDDA_260326.exe!UnknownFunction
[2026.03.29-19.28.37:921][ 61]LogWindows: Error: [Callstack] 0x00007ff634a9e2ba MTDDA_260326.exe!UnknownFunction
[2026.03.29-19.28.37:921][ 61]LogWindows: Error: [Callstack] 0x00007ff634aaa0d4 MTDDA_260326.exe!UnknownFunction
[2026.03.29-19.28.37:921][ 61]LogWindows: Error: [Callstack] 0x00007ff639d3c00a MTDDA_260326.exe!UnknownFunction
[2026.03.29-19.28.37:921][ 61]LogWindows: Error: [Callstack] 0x00007ffeca867374 KERNEL32.DLL!UnknownFunction
[2026.03.29-19.28.37:921][ 61]LogWindows: Error:
[2026.03.29-19.28.37:928][ 61]LogExit: Executing StaticShutdownAfterError
[2026.03.29-19.28.37:932][ 61]LogWindows: FPlatformMisc::RequestExit(1, LaunchWindowsStartup.ExceptionHandler)
[2026.03.29-19.28.37:932][ 61]LogWindows: FPlatformMisc::RequestExitWithStatus(1, 3, LaunchWindowsStartup.ExceptionHandler)
[2026.03.29-19.28.37:932][ 61]LogCore: Engine exit requested (reason: Win RequestExit)
Steps to Reproduce:
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Package project as Development build
-
Run the packaged build and play for several minutes
-
Crash occurs intermittently — typically within 10-15 minutes