After creating a smoothed surface from a segmentation, the app crashes.

This might also occur under other OSes.

Thread 3 Crashed:
0 libSystem.B.dylib 0x00007fff815dffde semwait_signal_nocancel + 10
1 libSystem.B.dylib 0x00007fff815dfee0 nanosleep$NOCANCEL + 129
2 libSystem.B.dylib 0x00007fff8163c886 usleep$NOCANCEL + 57
3 libSystem.B.dylib 0x00007fff8165be3c abort + 93
4 libstdc++.6.dylib 0x00007fff86fd25d2 tcf_0 + 0
5 libobjc.A.dylib 0x00007fff8352ad3d _objc_terminate + 120
6 libstdc++.6.dylib 0x00007fff86fd0ae1 cxxabiv1::terminate(void (*)()) + 11
7 libstdc++.6.dylib 0x00007fff86fd0b16 cxxabiv1::unexpected(void (*)()) + 0
8 libstdc++.6.dylib 0x00007fff86fd0bfc __gxx_exception_cleanup(_Unwind_Reason_Code, _Unwind_Exception*) + 0
9 libmitkCoreExt.dylib 0x0000000102cc035e void mitk::NonBlockingAlgorithm::GetParameter<bool>(char const*, bool&) const + 424 (mitkNonBlockingAlgorithm.h:160)
10 libmitkCoreExt.dylib 0x0000000102cc1df8 mitk::ShowSegmentationAsSurface::ThreadedUpdateFunction() + 82 (mitkShowSegmentationAsSurface.cpp:86)
11 libmitkCoreExt.dylib 0x0000000102c34dbf mitk::NonBlockingAlgorithm::StaticNonBlockingAlgorithmThread(void*) + 189 (mitkNonBlockingAlgorithm.cpp:161)
12 libSystem.B.dylib 0x00007fff815a5f8e _pthread_start + 331
13 libSystem.B.dylib 0x00007fff815a5e41 thread_start + 13