Crash after few seconds

Hello,
my project spawns via Blueprint 100.000 mesh instances,
Since today sometimes when I start after few seconds I get this crash:

MachineId:E1B42031476D847F0C14B98231D77328
EpicAccountId:

Access violation - code c0000005 (first/second chance not available)

PhysX3PROFILE_x64!physx::Sq::AABBPruner::updateObjects() [d:\build\++ue4+release-4.14+physx_compile\sync\engine\source\thirdparty\physx\physx_3.4\source\scenequery\src\sqaabbpruner.cpp:171]
PhysX3PROFILE_x64!physx::Sq::DynamicBoundsSync::sync() [d:\build\++ue4+release-4.14+physx_compile\sync\engine\source\thirdparty\physx\physx_3.4\source\scenequery\src\sqscenequerymanager.cpp:497]
PhysX3PROFILE_x64!physx::Sc::SqBoundsManager::syncBounds() [d:\build\++ue4+release-4.14+physx_compile\sync\engine\source\thirdparty\physx\physx_3.4\source\simulationcontroller\src\scsqboundsmanager.cpp:116]
PhysX3PROFILE_x64!physx::Sc::Scene::syncSceneQueryBounds() [d:\build\++ue4+release-4.14+physx_compile\sync\engine\source\thirdparty\physx\physx_3.4\source\simulationcontroller\src\scscene.cpp:3700]
PhysX3PROFILE_x64!physx::NpScene::fetchResultsPostContactCallbacks() [d:\build\++ue4+release-4.14+physx_compile\sync\engine\source\thirdparty\physx\physx_3.4\source\physx\src\npscene.cpp:2242]
PhysX3PROFILE_x64!physx::NpScene::fetchResults() [d:\build\++ue4+release-4.14+physx_compile\sync\engine\source\thirdparty\physx\physx_3.4\source\physx\src\npscene.cpp:2324]
APEXFrameworkPROFILE_x64!nvidia::apex::ApexScene::fetchResults() [d:\build\++ue4+release-4.14+physx_compile\sync\engine\source\thirdparty\physx\apex_1.4\framework\src\apexscene.cpp:1377]
UE4Editor_Engine!FPhysScene::ProcessPhysScene() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\engine\private\physicsengine\physscene.cpp:1088]
UE4Editor_Engine!TBaseRawMethodDelegateInstance<0,FPhysScene,void __cdecl(enum ENamedThreads::Type,TRefCountPtr<FGraphEvent> const & __ptr64),enum EPhysicsSceneType>::ExecuteIfSafe() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:639]
UE4Editor_Engine!TBaseDelegate<void,enum ENamedThreads::Type,TRefCountPtr<FGraphEvent> const & __ptr64>::ExecuteIfBound() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\core\public\delegates\delegatesignatureimpl.inl:609]
UE4Editor_Engine!TGraphTask<FDelegateGraphTask>::ExecuteTask() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\core\public\async\taskgraphinterfaces.h:868]
UE4Editor_Core!FNamedTaskThread::ProcessTasksNamedThread() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\core\private\async\taskgraph.cpp:932]
UE4Editor_Core!FNamedTaskThread::ProcessTasksUntilQuit() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\core\private\async\taskgraph.cpp:679]
UE4Editor_Core!FTaskGraphImplementation::WaitUntilTasksComplete() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\core\private\async\taskgraph.cpp:1776]
UE4Editor_Engine!FTickTaskSequencer::ReleaseTickGroup() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\engine\private\ticktaskmanager.cpp:525]
UE4Editor_Engine!FTickTaskManager::RunTickGroup() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\engine\private\ticktaskmanager.cpp:1437]
UE4Editor_Engine!UWorld::RunTickGroup() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\engine\private\leveltick.cpp:730]
UE4Editor_Engine!UWorld::Tick() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\engine\private\leveltick.cpp:1356]
UE4Editor_UnrealEd!UEditorEngine::Tick() [d:\build\++ue4+release-4.14+compile\sync\engine\source\editor\unrealed\private\editorengine.cpp:1422]
UE4Editor_UnrealEd!UUnrealEdEngine::Tick() [d:\build\++ue4+release-4.14+compile\sync\engine\source\editor\unrealed\private\unrealedengine.cpp:371]
UE4Editor!FEngineLoop::Tick() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\launch\private\launchengineloop.cpp:2859]
UE4Editor!GuardedMain() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\launch\private\launch.cpp:152]
UE4Editor!GuardedMainWrapper() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:126]
UE4Editor!WinMain() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:202]
UE4Editor!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:264]
kernel32
ntdll