MITK crashes with the following error:
An invalid parameter was passed to a function that considers invalid parameters fatal.

That happens when calling name.back() with an empty name. It is produced by Directory::Load.
Call stack:

• mitk::nnUNetTool::~nnUNetTool()
• itksys::SystemTools::RemoveADirectory(this->GetMitkTempDir())
• dir.Load(source)

To reproduce:

1. open MITK, load an image
2. open the Segmentation view
3. create a new segmentation node
4. close the Segmentation View
5. open the Segmentation View again

Alternative:

1. open MITK, load an image
2. open the Segmentation view
3. close the workbench via "x"

Happens on Windows, only in debug.