diff --git a/src/libslic3r/GCodeWriter.cpp b/src/libslic3r/GCodeWriter.cpp
index d17527d115..e72bbb6685 100644
--- a/src/libslic3r/GCodeWriter.cpp
+++ b/src/libslic3r/GCodeWriter.cpp
@@ -45,6 +45,7 @@ void GCodeWriter::apply_print_config(const PrintConfig &print_config)
 void GCodeWriter::set_extruders(std::vector<unsigned int> extruder_ids)
 {
     std::sort(extruder_ids.begin(), extruder_ids.end());
+    m_extruder = nullptr; // this points to object inside `m_extruders`, so should be cleared too
     m_extruders.clear();
     m_extruders.reserve(extruder_ids.size());
     for (unsigned int extruder_id : extruder_ids)