Import then cancel while file is read leads to potential crash

VCRUNTIME140!0x00007fffcc450000 + 12377
TwinmotionCookedEditor-Win64-Shipping!FString::operator=(FString const &) [Engine/Source/Runtime/Core/Public/Containers/UnrealString.h.inl:76]
TwinmotionCookedEditor-Win64-Shipping!CImporterMootools::readFile(FString const &) [Twinmotion/Source/TwinmotionImport/Private/ImportLegacy/ImporterMootools.cpp:179]
TwinmotionCookedEditor-Win64-Shipping!TAsyncQueuedWork<bool>::DoThreadedWork() [Engine/Source/Runtime/Core/Public/Async/Async.h:236]
TwinmotionCookedEditor-Win64-Shipping!FQueuedThreadPoolWrapper::FScheduledWork::DoThreadedWork() [Engine/Source/Runtime/Core/Public/Misc/QueuedThreadPoolWrapper.h:144]
TwinmotionCookedEditor-Win64-Shipping!class LowLevelTasks::FTask * ??R<lambda_1>@?4???$Init@V<lambda_1>@?1??AddQueuedWork@FQueuedLowLevelThreadPool@@EEAAXPEAVIQueuedWork@@W4EQueuedWorkPriority@@@Z@@FTask@LowLevelTasks@@QEAAXPEB_WW4ETaskPriority@2@$$QEAV0?1??AddQueuedWork@FQueuedLowLevelThreadPool@@EEAAXPEAVIQueuedWork@@W4EQueuedWorkPriority@@@Z@W4ETaskFlags@2@@Z@QEAAPEAV12@_N@Z(const bool) [Engine/Source/Runtime/Core/Public/Async/Fundamental/Task.h:499]
TwinmotionCookedEditor-Win64-Shipping!class LowLevelTasks::FTask * ?CallAndMove@?$TTaskDelegateImpl@V<lambda_1>@?4???$Init@V<lambda_1>@?1??AddQueuedWork@FQueuedLowLevelThreadPool@@EEAAXPEAVIQueuedWork@@W4EQueuedWorkPriority@@@Z@@FTask@LowLevelTasks@@QEAAXPEB_WW4ETaskPriority@3@$$QEAV1?1??AddQueuedWork@FQueuedLowLevelThreadPool@@EEAAXPEAVIQueuedWork@@W4EQueuedWorkPriority@@@Z@W4ETaskFlags@3@@Z@$0A@@?$TTaskDelegate@$$A6APEAVFTask@LowLevelTasks@@_N@Z$0DA@@LowLevelTasks@@UEAAPEAVFTask@3@AEAV23@PEAXI_N@Z(class LowLevelTasks::TTaskDelegate<LowLevelTasks::FTask * __cdecl(bool),48> & const, void *, unsigned int, bool) [Engine/Source/Runtime/Core/Public/Async/Fundamental/TaskDelegate.h:171]
TwinmotionCookedEditor-Win64-Shipping!LowLevelTasks::FTask::ExecuteTask() [Engine/Source/Runtime/Core/Public/Async/Fundamental/Task.h:627]
TwinmotionCookedEditor-Win64-Shipping!LowLevelTasks::FScheduler::WorkerLoop(LowLevelTasks::Private::FWaitEvent *,LowLevelTasks::Private::TLocalQueueRegistry<1024,1024>::TLocalQueue *,unsigned int,bool) [Engine/Source/Runtime/Core/Private/Async/Fundamental/Scheduler.cpp:724]
TwinmotionCookedEditor-Win64-Shipping!static void ??R<lambda_1>@?1??CreateWorker@FScheduler@LowLevelTasks@@AEAA?AV?$TUniquePtr@VFThread@@U?$TDefaultDelete@VFThread@@@@@@IPEB_W_NW4EForkable@FThread@@PEAUFWaitEvent@Private@3@PEAVTLocalQueue@?$TLocalQueueRegistry@$0EAA@$0EAA@@83@W4EThreadPriority@@_K@Z@QEBA@XZ() [Engine/Source/Runtime/Core/Private/Async/Fundamental/Scheduler.cpp:188]
TwinmotionCookedEditor-Win64-Shipping!FThreadImpl::Run() [Engine/Source/Runtime/Core/Private/HAL/Thread.cpp:68]
TwinmotionCookedEditor-Win64-Shipping!FRunnableThreadWin::Run() [Engine/Source/Runtime/Core/Private/Windows/WindowsRunnableThread.cpp:159]
TwinmotionCookedEditor-Win64-Shipping!FRunnableThreadWin::GuardedRun() [Engine/Source/Runtime/Core/Private/Windows/WindowsRunnableThread.cpp:79]
KERNEL32!0x00007fffec100000 + 17374
ntdll!0x00007fffedbd0000 + 4cc91