diff --git a/src/slic3r/GUI/ImageGrid.cpp b/src/slic3r/GUI/ImageGrid.cpp
index 9944abb363..624c0539d5 100644
--- a/src/slic3r/GUI/ImageGrid.cpp
+++ b/src/slic3r/GUI/ImageGrid.cpp
@@ -224,6 +224,7 @@ void ImageGrid::UpdateLayout()
 
 void Slic3r::GUI::ImageGrid::UpdateFocusRange()
 {
+    if (!m_file_sys) return;
     wxSize  size = GetClientSize();
     wxPoint off;
     int     index = firstItem(size, off);