diff --git a/src/libslic3r/Emboss.cpp b/src/libslic3r/Emboss.cpp
index ce32efd7e..c21052a0c 100644
--- a/src/libslic3r/Emboss.cpp
+++ b/src/libslic3r/Emboss.cpp
@@ -485,8 +485,11 @@ std::optional<Emboss::Glyph> Emboss::letter2glyph(const Font &font,
 Polygons Emboss::text2polygons(const Font &    font,
                                const char *    text,
                                const FontProp &font_prop,
-                               Glyphs &        cache)
+                               Glyphs *        cache)
 {
+    Glyphs tmp;
+    if (cache == nullptr) cache = &tmp;
+
     std::optional<stbtt_fontinfo> font_info_opt;
     
     Point    cursor(0, 0);
@@ -501,8 +504,8 @@ Polygons Emboss::text2polygons(const Font &    font,
         } 
         int unicode = static_cast<int>(wc);
         std::optional<Glyph> glyph_opt;
-        auto glyph_item = cache.find(unicode);
-        if (glyph_item != cache.end()) glyph_opt = glyph_item->second;
+        auto glyph_item = cache->find(unicode);
+        if (glyph_item != cache->end()) glyph_opt = glyph_item->second;
         else {
             if (!font_info_opt.has_value()) {
                 font_info_opt = Privat::load_font_info(font);
@@ -513,7 +516,7 @@ Polygons Emboss::text2polygons(const Font &    font,
                                           font_prop.flatness);
             // has definition inside of font?
             if (!glyph_opt.has_value()) continue;
-            cache[unicode] = *glyph_opt;
+            cache->operator[](unicode) = *glyph_opt;
         }
         
         // move glyph to cursor position
diff --git a/src/libslic3r/Emboss.hpp b/src/libslic3r/Emboss.hpp
index 9082ccce0..aa13fe6d6 100644
--- a/src/libslic3r/Emboss.hpp
+++ b/src/libslic3r/Emboss.hpp
@@ -117,7 +117,7 @@ public:
     static Polygons text2polygons(const Font &    font,
                                   const char *    text,
                                   const FontProp &font_prop,
-                                  Glyphs &        cache = Glyphs());
+                                  Glyphs *        cache = nullptr);
 
     /// <summary>
     /// Project 2d point into space
diff --git a/src/slic3r/GUI/Gizmos/GLGizmoEmboss.cpp b/src/slic3r/GUI/Gizmos/GLGizmoEmboss.cpp
index 91c36c4ed..ae1e390d2 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmoEmboss.cpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmoEmboss.cpp
@@ -275,8 +275,8 @@ bool GLGizmoEmboss::gizmo_event(SLAGizmoEventType action,
 void GLGizmoEmboss::process() {
     if (!m_font.has_value()) return;
 
-    Polygons polygons = Emboss::text2polygons(*m_font, m_text.get(), m_font_prop, m_font_glyph_cache);
-    if (polygons.empty()) return;
+    Polygons polygons = Emboss::text2polygons(*m_font, m_text.get(), m_font_prop, &m_font_glyph_cache);
+    if (polygons.empty()) return; 
 
     auto project = std::make_unique<Emboss::ProjectScale>(
         std::make_unique<Emboss::ProjectZ>(m_emboss/m_scale), m_scale);