Fix of #3371

src/slic3r/GUI/GLCanvas3D.cpp

@@ -1137,6 +1137,12 @@ bool GLCanvas3D::LegendTexture::generate(const GCodePreviewData& preview_data, c
 
     // calculate scaling
     const float scale_gl = canvas.get_canvas_size().get_scale_factor();
+#if ENABLE_RETINA_GL
+    // For non-visible or non-created window getBackingScaleFactor function return 0.0 value.
+    // And using of the zero scale causes a crash, when we trying to draw text to the (0,0) rectangle
+    if (scale_gl <= 0.0f)
+        return false;
+#endif
     const float scale = scale_gl * wxGetApp().em_unit()*0.1; // get scale from em_unit() value, because of get_scale_factor() return 1 
     const int scaled_square = std::floor((float)Px_Square * scale);
     const int scaled_title_offset = Px_Title_Offset * scale;