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Setting Texture Paramter Value leads to crash.

Hey, so I am experimenting with setting a Texture Paramter inside a C++ class, but it crashes every time. My C++ source file inside the constructor:


     static ConstructorHelpers::FObjectFinder<UStaticMesh> meshFinder(TEXT("StaticMesh'/Engine/EditorMeshes/EditorCube.EditorCube'"));
     static ConstructorHelpers::FObjectFinder<UMaterial> materialFinder(TEXT("Material'/Game/Voxel/Materials/M_QR.M_QR'"));
     static ConstructorHelpers::FObjectFinder<UTexture> textureFinder(TEXT("Texture'/Engine/EngineMaterials/T_Default_Material_Grid_M.T_Default_Material_Grid_M'"));
 
     mesh = CreateDefaultSubobject<UStaticMeshComponent>(TEXT("Mesh"));
 
     UMaterial* material = materialFinder.Object;
     UMaterialInstanceDynamic* minst = (UMaterialInstanceDynamic*)material;
     UTexture* texture = textureFinder.Object;
     minst->SetTextureParameterValue(FName(TEXT("QRTexture")), texture);
 
     if (meshFinder.Object)
         mesh->SetStaticMesh(meshFinder.Object);
 
     mesh->SetMaterial(0, minst);
 
     mesh->SetWorldScale3D(FVector(0.1, 1, 1));
     mesh->bVisible = true;
     RootComponent = mesh;


The paramteter is just an TextureSampleParameter2D, and I get this crash message when I compile and after that everytime I open the editor:


MachineId:AD538CEE405F8A26A01B3B910D50B2A2
 EpicAccountId:d0fb234b758f4f36a97f7bdbbe031216
 
 Access violation - code c0000005 (first/second chance not available)
 
 ""
 
 UE4Editor_Engine!FMaterialRenderProxy::InvalidateUniformExpressionCache() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\engine\private\materials\materialshared.cpp:1652]
 UE4Editor_Engine!FMaterialInstanceResource::RenderThread_UpdateParameter<UTexture const * __ptr64>() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\engine\private\materials\materialinstancesupport.h:118]
 UE4Editor_Engine!EURCMacro_SetMIParameterValue<FTextureParameterValue>::DoTask() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\engine\private\materials\materialinstance.cpp:322]
 UE4Editor_Engine!TGraphTask<EURCMacro_SetMIParameterValue<FTextureParameterValue> >::ExecuteTask() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\core\public\async	askgraphinterfaces.h:779]
 UE4Editor_Core!FTaskThread::ProcessTasks() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\core\private\async	askgraph.cpp:539]
 UE4Editor_Core!FTaskThread::ProcessTasksUntilQuit() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\core\private\async	askgraph.cpp:340]
 UE4Editor_RenderCore!RenderingThreadMain() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\rendercore\private\renderingthread.cpp:310]
 UE4Editor_RenderCore!FRenderingThread::Run() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\rendercore\private\renderingthread.cpp:411]
 UE4Editor_Core!FRunnableThreadWin::Run() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.9\engine\source\runtime\core\private\windows\windowsrunnablethread.cpp:74]


Any suggetions?