Fixes after the merge of changes by @alexrj.

1 files changed, 1 insertions, 1 deletions

diff --git a/xs/src/libslic3r/PrintObject.cpp b/xs/src/libslic3r/PrintObject.cpp
index b276744c4..7b5014414 100644
--- a/xs/src/libslic3r/PrintObject.cpp
+++ b/xs/src/libslic3r/PrintObject.cpp
@@ -974,7 +974,7 @@ PrintObject::_make_perimeters()
                     
                     // check whether a portion of the upper slices falls inside the critical area
                     const Polylines intersection = intersection_pl(
-                        upper_layerm_polygons,
+                        to_polylines(upper_layerm_polygons),
                         critical_area
                     );