diff --git a/src/libslic3r/GCode/SeamPlacer.cpp b/src/libslic3r/GCode/SeamPlacer.cpp
index b57d4470b7c..9738a001614 100644
--- a/src/libslic3r/GCode/SeamPlacer.cpp
+++ b/src/libslic3r/GCode/SeamPlacer.cpp
@@ -786,16 +786,16 @@ void SeamPlacer::apply_custom_seam(const Polygon& polygon, size_t po_idx,
 
 std::optional<Point> SeamHistory::get_last_seam(const PrintObject* po, size_t layer_id, const BoundingBox& island_bb)
 {
-    assert(layer_id >= m_layer_id);
-    if (layer_id > m_layer_id) {
+    assert(layer_id >= m_layer_id || layer_id == 0);
+    if (layer_id != m_layer_id) {
         // Get seam was called for different layer than last time.
+        if (layer_id == 0) // seq printing
+            m_data_this_layer.clear();
         m_data_last_layer = m_data_this_layer;
         m_data_this_layer.clear();
         m_layer_id = layer_id;
     }
 
-
-
     std::optional<Point> out;
 
     auto seams_it = m_data_last_layer.find(po);