Users custom AI-heavy project crashes if anything is Built

Users custom AI project crashes if anything is Built. (All, Lighting, Geometry, etc.)

The project can be played but receives a message during play that the Navmesh needs to be rebuilt.

1. Download the users project
2. Unzip & open the project
3. If the project crashes on load, attempt to open the project again (It should load on the first attempt but it may take more)
4. Once opened, click the Build icon at the top

Results: The users project will crash if anything is rebuilt

Expected: To be able to rebuild the project without crashing

MachineId:DE189244480D3CD0F8CA729A02DD38A6
EpicAccountId:75f47e038a8442f0af6c18e1f38eeb85

Unknown exception - code 00000001 (first/second chance not available)

Assertion failed: NavigationData [Link Removed] [Line: 1149]

KERNELBASE + 37901 bytes
UE4Editor_Core + 3140052 bytes
UE4Editor_Core + 1614600 bytes
UE4Editor_Core + 1494994 bytes
UE4Editor_Engine + 10458704 bytes
UE4Editor_Engine + 10458124 bytes
UE4Editor_Engine + 733124 bytes
UE4Editor_CoreUObject + 570740 bytes
UE4Editor_CoreUObject + 1353417 bytes
UE4Editor_CoreUObject + 1477821 bytes
UE4Editor_CoreUObject + 1621702 bytes
UE4Editor_CoreUObject + 1483596 bytes
UE4Editor_CoreUObject + 1354844 bytes
UE4Editor_CoreUObject + 1627204 bytes
UE4Editor_CoreUObject + 1483596 bytes
UE4Editor_CoreUObject + 1354844 bytes
UE4Editor_CoreUObject + 1627204 bytes
UE4Editor_CoreUObject + 1483596 bytes
UE4Editor_CoreUObject + 570740 bytes
UE4Editor_CoreUObject + 1481403 bytes
UE4Editor_Engine + 1552211 bytes
UE4Editor_Engine + 1356968 bytes
UE4Editor_Engine + 1609354 bytes
UE4Editor_Engine + 5069258 bytes
UE4Editor_Engine + 10088576 bytes
UE4Editor_UnrealEd + 6237773 bytes
UE4Editor_UnrealEd + 6405102 bytes
UE4Editor_UnrealEd + 2624356 bytes
UE4Editor_UnrealEd + 2875346 bytes
UE4Editor_UnrealEd + 2837668 bytes
UE4Editor_UnrealEd + 2761472 bytes
UE4Editor_UnrealEd + 2678685 bytes
UE4Editor_UnrealEd + 6364224 bytes
UE4Editor_UnrealEd + 2180543 bytes
UE4Editor_LevelEditor + 578439 bytes
UE4Editor_Slate + 594022 bytes
UE4Editor_Slate + 1551501 bytes
UE4Editor_Slate + 1042839 bytes
UE4Editor_Slate + 1049209 bytes
UE4Editor_Slate + 1450345 bytes
UE4Editor_Slate + 2152010 bytes
UE4Editor_Slate + 2339043 bytes
UE4Editor_Slate + 437180 bytes
UE4Editor_Slate + 162647 bytes
UE4Editor_Slate + 843027 bytes
UE4Editor_Slate + 779190 bytes
UE4Editor_Core + 2485385 bytes
UE4Editor_Core + 2432715 bytes
UE4Editor_Core + 2490430 bytes
UE4Editor_Core + 2422370 bytes
user32 + 105425 bytes
user32 + 104666 bytes
UE4Editor_Core + 3123702 bytes
UE4Editor!FEngineLoop::Tick() + 3641 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\launch\private\launchengineloop.cpp:2216]
UE4Editor!GuardedMain() + 479 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\launch\private\launch.cpp:131]
UE4Editor!GuardedMainWrapper() + 26 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\launch\private\windows\launchwindows.cpp:126]
UE4Editor!WinMain() + 249 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\launch\private\windows\launchwindows.cpp:202]
UE4Editor!__tmainCRTStartup() + 329 bytes [f:\dd\vctools\crt\crtw32\dllstuff\crtexe.c:618]

Engine crashes after building navigation