diff --git a/Gui/VtkVis/VtkCompositeImageToCylindersFilter.cpp b/Gui/VtkVis/VtkCompositeImageToCylindersFilter.cpp
index 58a43d60508400e3f57db51f37fc38453c7e4f36..f2a90569fcdaed432de907c1a6ed341a0a7735a1 100644
--- a/Gui/VtkVis/VtkCompositeImageToCylindersFilter.cpp
+++ b/Gui/VtkVis/VtkCompositeImageToCylindersFilter.cpp
@@ -30,7 +30,7 @@
 
 VtkCompositeImageToCylindersFilter::VtkCompositeImageToCylindersFilter(
         vtkAlgorithm* inputAlgorithm )
-	: VtkCompositeFilter(inputAlgorithm)
+	: VtkCompositeFilter(inputAlgorithm), _lineFilter(nullptr)
 {
 	this->init();
 }