diff --git a/src/slic3r/GUI/PartPlate.cpp b/src/slic3r/GUI/PartPlate.cpp
index 415e1ea0f5..a1211f4692 100644
--- a/src/slic3r/GUI/PartPlate.cpp
+++ b/src/slic3r/GUI/PartPlate.cpp
@@ -2662,7 +2662,8 @@ bool PartPlate::check_outside(int obj_id, int instance_id, BoundingBoxf3* boundi
 
 	if (instance_box.min.z() < SINKING_Z_THRESHOLD) {
 		// Orca: For sinking object, we use a more expensive algorithm so part below build plate won't be considered
-		if (plate_box.intersects(instance_box)) {
+		// m_plater is null in CLI mode.
+		if (m_plater && plate_box.intersects(instance_box)) {
 			// TODO: FIXME: this does not take exclusion area into account
             const BuildVolume build_volume(get_shape(), m_plater->build_volume().printable_height(), m_extruder_areas, m_extruder_heights);
 			const auto state = instance->calc_print_volume_state(build_volume);