Package Error - EXCEPTION_ACCESS_VIOLATION reading address 0x00000001

Development Platform & Builds
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Cooking the project succeeds, actually packaging it fails.
I think it may be something to do with TMaps that I started using recently.

Abbreviated log below, full log attached. (Full log has a lot of noise in it as I haven’t dealt with the warnings in a while)

LogWindows:Error: === Critical error: ===

LogWindows:Error:

LogWindows:Error: Fatal error

Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x00000001

LogWindows:Error: ucrtbase.dll!0x000000003B8D4CCD

LogWindows:Error: ucrtbase.dll!0x000000003B8BBD11

LogWindows:Error: ucrtbase.dll!0x000000003B8BAE8F

LogWindows:Error: UE4Editor-Core.dll!0x00000000D392B6F8

LogWindows:Error: UE4Editor-BlueprintCompilerCppBackend.dll!0x00000000C461893B

LogWindows:Error: UE4Editor-BlueprintCompilerCppBackend.dll!0x00000000C463B5F4

LogWindows:Error: UE4Editor-BlueprintCompilerCppBackend.dll!0x00000000C463FDB2

LogWindows:Error: UE4Editor-BlueprintCompilerCppBackend.dll!0x00000000C4637018

LogWindows:Error: UE4Editor-BlueprintCompilerCppBackend.dll!0x00000000C465A295

LogWindows:Error: UE4Editor-BlueprintCompilerCppBackend.dll!0x00000000C46328D1

LogWindows:Error: UE4Editor-BlueprintCompilerCppBackend.dll!0x00000000C4632465

LogWindows:Error: UE4Editor-BlueprintCompilerCppBackend.dll!0x00000000C464970C

LogWindows:Error: UE4Editor-KismetCompiler.dll!0x00000000C5FC9E39

LogWindows:Error: UE4Editor-KismetCompiler.dll!0x00000000C5FCC2C6

LogWindows:Error: UE4Editor-KismetCompiler.dll!0x00000000C5FCB94D

LogWindows:Error: UE4Editor-BlueprintNativeCodeGen.dll!0x00000000C5DF556C

LogWindows:Error: UE4Editor-BlueprintNativeCodeGen.dll!0x00000000C5DF8127

LogWindows:Error: UE4Editor-BlueprintNativeCodeGen.dll!0x00000000C5DF5EDA

LogWindows:Error: UE4Editor-UnrealEd.dll!0x00000000C90E83E8

LogWindows:Error: UE4Editor-UnrealEd.dll!0x00000000C914C3A2

LogWindows:Error: UE4Editor-UnrealEd.dll!0x00000000C901045D

LogWindows:Error: UE4Editor-UnrealEd.dll!0x00000000C9003BF2

LogWindows:Error: UE4Editor-Cmd.exe!0x00000000DF3E776F

LogWindows:Error: UE4Editor-Cmd.exe!0x00000000DF3DE96A

LogWindows:Error: UE4Editor-Cmd.exe!0x00000000DF3DEBBA

LogWindows:Error: UE4Editor-Cmd.exe!0x00000000DF3F0A29

LogWindows:Error: UE4Editor-Cmd.exe!0x00000000DF3F16FE

LogWindows:Error: KERNEL32.DLL!0x000000003E2F2774

LogWindows:Error: ntdll.dll!0x000000003F1D0D61

LogWindows:Error: ntdll.dll!0x000000003F1D0D61

LogWindows:Error:

LogWindows:Error: end: stack for UAT

Things I have tried:

  1. Deleting saved/Intermeidate folders
  2. Removing all TMaps from the code/Bps
  3. Migrating to 4.16
  4. Removing all Navmeshs(mentioned in another post)
  5. Creating a new project and migrating everything across

Any ideas?