diff --git a/src/libslic3r/GCode/ExtrusionProcessor.cpp b/src/libslic3r/GCode/ExtrusionProcessor.cpp
index 3f5d8f1d54..f5acf4749a 100644
--- a/src/libslic3r/GCode/ExtrusionProcessor.cpp
+++ b/src/libslic3r/GCode/ExtrusionProcessor.cpp
@@ -86,16 +86,17 @@ ExtrusionPaths calculate_and_split_overhanging_extrusions(const ExtrusionPath
     return result;
 };
 
-ExtrusionEntityCollection calculate_and_split_overhanging_extrusions(const ExtrusionEntityCollection            &ecc,
+ExtrusionEntityCollection calculate_and_split_overhanging_extrusions(const ExtrusionEntityCollection            *ecc,
                                                                      const AABBTreeLines::LinesDistancer<Linef> &unscaled_prev_layer,
                                                                      const AABBTreeLines::LinesDistancer<CurledLine> &prev_layer_curled_lines)
 {
-    ExtrusionEntityCollection result;
-    result.no_sort = ecc.no_sort;
-    for (const auto *e : ecc.entities) {
-        if (auto *col = static_cast<const ExtrusionEntityCollection *>(e)) {
-            auto new_col = calculate_and_split_overhanging_extrusions(*col, unscaled_prev_layer, prev_layer_curled_lines);
-            result.append(new_col);
+    ExtrusionEntityCollection result{};
+    result.no_sort = ecc->no_sort;
+    for (const auto *e : ecc->entities) {
+        if (e == nullptr) {
+             BOOST_LOG_TRIVIAL(debug) << "perimeters collections contain nullptr entities for some reason";
+        } else if (auto *col = static_cast<const ExtrusionEntityCollection *>(e)) {
+            result.append(calculate_and_split_overhanging_extrusions(col, unscaled_prev_layer, prev_layer_curled_lines));
         } else if (auto *loop = static_cast<const ExtrusionLoop *>(e)) {
             ExtrusionLoop new_loop = *loop;
             new_loop.paths.clear();
diff --git a/src/libslic3r/GCode/ExtrusionProcessor.hpp b/src/libslic3r/GCode/ExtrusionProcessor.hpp
index 0d60ad9851..c303618e46 100644
--- a/src/libslic3r/GCode/ExtrusionProcessor.hpp
+++ b/src/libslic3r/GCode/ExtrusionProcessor.hpp
@@ -218,7 +218,7 @@ ExtrusionPaths calculate_and_split_overhanging_extrusions(const ExtrusionPath
                                                           const AABBTreeLines::LinesDistancer<Linef>       &unscaled_prev_layer,
                                                           const AABBTreeLines::LinesDistancer<CurledLine> &prev_layer_curled_lines);
 
-ExtrusionEntityCollection calculate_and_split_overhanging_extrusions(const ExtrusionEntityCollection           &ecc,
+ExtrusionEntityCollection calculate_and_split_overhanging_extrusions(const ExtrusionEntityCollection           *ecc,
                                                                      const AABBTreeLines::LinesDistancer<Linef> &unscaled_prev_layer,
                                                                      const AABBTreeLines::LinesDistancer<CurledLine> &prev_layer_curled_lines);
 
diff --git a/src/libslic3r/Print.cpp b/src/libslic3r/Print.cpp
index 2dac942e9e..f9c74058eb 100644
--- a/src/libslic3r/Print.cpp
+++ b/src/libslic3r/Print.cpp
@@ -914,6 +914,8 @@ void Print::process()
         obj->generate_support_material();
     for (PrintObject *obj : m_objects)
         obj->estimate_curled_extrusions();
+    for (PrintObject *obj : m_objects)
+        obj->calculate_overhanging_perimeters();
     if (this->set_started(psWipeTower)) {
         m_wipe_tower_data.clear();
         m_tool_ordering.clear();
diff --git a/src/libslic3r/PrintObject.cpp b/src/libslic3r/PrintObject.cpp
index fd457e1691..43e2937238 100644
--- a/src/libslic3r/PrintObject.cpp
+++ b/src/libslic3r/PrintObject.cpp
@@ -561,7 +561,7 @@ void PrintObject::calculate_overhanging_perimeters()
                         continue;
                     }
                     ExPolygons prev_layer_polygon = l->lower_layer == nullptr ? ExPolygons() : l->lower_layer->lslices;
-                    layer_region->m_perimeters    = calculate_and_split_overhanging_extrusions(layer_region->m_perimeters,
+                    layer_region->m_perimeters    = calculate_and_split_overhanging_extrusions(&layer_region->m_perimeters,
                                                                                                unscaled_polygons_lines[l->id()],
                                                                                                curled_lines[l->id()]);
                 }