diff --git a/src/slic3r/GUI/ImageGrid.cpp b/src/slic3r/GUI/ImageGrid.cpp
index ed34579d9..be60185f6 100644
--- a/src/slic3r/GUI/ImageGrid.cpp
+++ b/src/slic3r/GUI/ImageGrid.cpp
@@ -220,6 +220,7 @@ void ImageGrid::UpdateLayout()
 
 void Slic3r::GUI::ImageGrid::UpdateFocusRange()
 {
+    if (!m_file_sys) return;
     wxSize  size = GetClientSize();
     wxPoint off;
     int     index = firstItem(size, off);