diff --git a/cura/LayerPolygon.py b/cura/LayerPolygon.py
index 4509ba7d26..959ac9ad84 100644
--- a/cura/LayerPolygon.py
+++ b/cura/LayerPolygon.py
@@ -60,7 +60,7 @@ class LayerPolygon:
         # Only if the type of line segment changes do we need to add an extra vertex to change colors
         self._build_cache_needed_points[1:, 0][:, numpy.newaxis] = self._types[1:] != self._types[:-1]
         # Mark points as unneeded if they are of types we don't want in the line mesh according to the calculated mask
-        numpy.logical_and(self._build_cache_needed_points, self._build_cache_line_mesh_mask )
+        numpy.logical_and(self._build_cache_needed_points, self._build_cache_line_mesh_mask, self._build_cache_needed_points )
 
         self._vertex_begin = 0
         self._vertex_end = numpy.sum( self._build_cache_needed_points )
diff --git a/plugins/CuraEngineBackend/ProcessSlicedLayersJob.py b/plugins/CuraEngineBackend/ProcessSlicedLayersJob.py
index 49c306ea77..a00ab69d67 100644
--- a/plugins/CuraEngineBackend/ProcessSlicedLayersJob.py
+++ b/plugins/CuraEngineBackend/ProcessSlicedLayersJob.py
@@ -131,7 +131,7 @@ class ProcessSlicedLayersJob(Job):
                 new_points = numpy.empty((len(points), 3), numpy.float32)
                 if polygon.point_type == 0:  # Point2D
                     new_points[:, 0] = points[:, 0]
-                    new_points[:, 1] = layer.height / 1000 # layer height value is in backend representation
+                    new_points[:, 1] = layer.height / 1000  # layer height value is in backend representation
                     new_points[:, 2] = -points[:, 1]
                 else: # Point3D
                     new_points[:, 0] = points[:, 0]