Index: mitkPicFileWriter.cpp
===================================================================
--- mitkPicFileWriter.cpp	(revision 25778)
+++ mitkPicFileWriter.cpp	(working copy)
@@ -59,6 +59,12 @@
 
   Image::Pointer input = const_cast<Image*>(this->GetInput());
 
+  if ( input.IsNull() )
+  {
+    std::cout << "Nothing to write: Input is NULL." << std::endl;
+    return;
+  }
+
   mitkIpPicDescriptor * picImage = input->GetPic();
   SlicedGeometry3D* slicedGeometry = input->GetSlicedGeometry();
   if (slicedGeometry != NULL)