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