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Loading a previously stored nifty segmentation (file format `nii` leads to a crash if either - the segmentation view is already open when the segmentation is loaded - the segmentation view is opened after the segmentation was loaded The error occurs here: `LabelSetImage::GetActiveLabelSet()` - `m_LabelSetContainer` is unknown - `this` is unknown This comes from the fact that inside `QmitkSegmentationView::EstablishLabelSetConnection` the call `auto workingImage = dynamic_cast<mitk::LabelSetImage*>(m_WorkingNode->GetData())` returns a nullptr. While there is no check for nullptr I'm wondering why the nifty image is not recognized as a LabelSetImage. I guess something was not written correctly to the file. To reproduce: - open MITK, load a simple image - create a new segmentation with a layer and a label (no need to draw something) - right click on the segmentation node and store as Nifty (*.nii) - remove the segmentation node from the data storage - load the saved nifty file - either while the segmentation view is still open - close the segmentation view before loading and open it again after loading

Loading a previously stored nifti segmentation (file format `nii`) leads to a crash if either - the segmentation view is already open when the segmentation is loaded - the segmentation view is opened after the segmentation was loaded The error occurs here: `LabelSetImage::GetActiveLabelSet()` - `m_LabelSetContainer` is unknown - `this` is unknown This comes from the fact that inside `QmitkSegmentationView::EstablishLabelSetConnection` the call `auto workingImage = dynamic_cast<mitk::LabelSetImage*>(m_WorkingNode->GetData())` returns a nullptr. While there is no check for nullptr I'm wondering why the nifti image is not recognized as a LabelSetImage. I guess something was not written correctly to the file. To reproduce: - open MITK, load a simple image - create a new segmentation with a layer and a label (no need to draw something) - right click on the segmentation node and store as nifti (*.nii) - remove the segmentation node from the data storage - load the saved nifti file - either while the segmentation view is still open - close the segmentation view before loading and open it again after loading

Loading a previously stored niftyi segmentation (file format `nii`) leads to a crash if either - the segmentation view is already open when the segmentation is loaded - the segmentation view is opened after the segmentation was loaded The error occurs here: `LabelSetImage::GetActiveLabelSet()` - `m_LabelSetContainer` is unknown - `this` is unknown This comes from the fact that inside `QmitkSegmentationView::EstablishLabelSetConnection` the call `auto workingImage = dynamic_cast<mitk::LabelSetImage*>(m_WorkingNode->GetData())` returns a nullptr. While there is no check for nullptr I'm wondering why the niftyi image is not recognized as a LabelSetImage. I guess something was not written correctly to the file. To reproduce: - open MITK, load a simple image - create a new segmentation with a layer and a label (no need to draw something) - right click on the segmentation node and store as Nifty (*nifti (*.nii) - remove the segmentation node from the data storage - load the saved niftyi file - either while the segmentation view is still open - close the segmentation view before loading and open it again after loading