diff --git a/apps/opencs/view/render/terrainselection.cpp b/apps/opencs/view/render/terrainselection.cpp
index 93a904689..cefcfa117 100644
--- a/apps/opencs/view/render/terrainselection.cpp
+++ b/apps/opencs/view/render/terrainselection.cpp
@@ -127,7 +127,7 @@ void CSVRender::TerrainSelection::update()
     mGeometry->setVertexArray(vertices);
     osg::ref_ptr<osg::DrawArrays> drawArrays = new osg::DrawArrays(osg::PrimitiveSet::LINES);
     drawArrays->setCount(vertices->size());
-    mGeometry->addPrimitiveSet(drawArrays);
+    if (vertices->size() != 0) mGeometry->addPrimitiveSet(drawArrays);
     mSelectionNode->addChild(mGeometry);
 }