diff --git a/src/libslic3r/Print.cpp b/src/libslic3r/Print.cpp
index 900ccc04d..bd84d2082 100644
--- a/src/libslic3r/Print.cpp
+++ b/src/libslic3r/Print.cpp
@@ -749,6 +749,9 @@ StringObjectException Print::validate(StringObjectException *warning, Polygons*
     }
 
     if (m_config.print_sequence == PrintSequence::ByObject) {
+        if (m_config.timelapse_type == TimelapseType::tlSmooth)
+            return {L("Smooth mode of timelapse is not supported when \"by object\" sequence is enabled.")};
+
         //BBS: refine seq-print validation logic
         auto ret = sequential_print_clearance_valid(*this, collison_polygons, height_polygons);
     	if (!ret.string.empty())