After reading the step file, there will be an exception when closing the application

If I do not read the STEP file, there is no exception.

Here is my reading code:
STEPControl_Reader *reader = new STEPControl_Reader();
IFSelect_ReturnStatus status = reader->ReadFile(file.toUtf8().data());
if (status != IFSelect_RetDone)
{
return ret;
}
Standard_Integer NbRoots = reader->NbRootsForTransfer();
Standard_Integer num = reader->TransferRoots();
Standard_Integer number = reader->NbShapes();
for (int rank = 1; rank <= number; ++rank)
{
}
delete reader

------------------------------------------
Exception location:

Standard_Type::~Standard_Type ()
{
// remove descriptor from the registry
registry_type& aRegistry = GetRegistry();
Standard_ASSERT(aRegistry.UnBind (mySystemName), "Standard_Type::~Standard_Type() cannot find itself in registry",); //!Error

// std::cout << "Unregistering " << mySystemName << ": " << aRegistry.Extent() << std::endl;
Standard::Free (mySystemName);
Standard::Free (myName);
}