4.18 VR Template Crash with no log

I build engine from source code in 4.18 version , and Create a template VR Project .
but when I open template VR Level , engine is crashed … and no log detected , it’s all just disappear
need some help ,thx
Nothing to write , just template project

Does this happen only with the VR template? All the other templates are working fine with your recompiled engine?

yes , all other project is fine …
and function call stopped in there

C:\UnrealBuild\UnrealEngine-4.18\UnrealEngine-4.18\Engine\Source\Runtime\Navmesh\Private\DetourDetourNavMesh.cpp

UE4Editor-Navmesh.dll!dtNavMesh::connectClusterLink(dtMeshTile * tile0, unsigned int clusterIdx0, dtMeshTile * tile1, unsigned int clusterIdx1, unsigned char flags, bool bCheckExisting)
line 1278

testLink.ref = cluster1Ref;

// exception : Write access conflict

when I click the map file HMD locomotion Map
or Motion Controller Map by right mouse button
is also crushed …
the default StartupMap is fine , everything is OK

Can you try to make a brand new empty project and just place a NavMesh in it. Does it also crash?