diff --git a/src/slic3r/GUI/ParamsPanel.cpp b/src/slic3r/GUI/ParamsPanel.cpp
index b0bb86825..3aa3d7c61 100644
--- a/src/slic3r/GUI/ParamsPanel.cpp
+++ b/src/slic3r/GUI/ParamsPanel.cpp
@@ -640,7 +640,7 @@ void ParamsPanel::msw_rescale()
     if (m_search_btn) m_search_btn->msw_rescale();
     if (m_compare_btn) m_compare_btn->msw_rescale();
     if (m_tips_arrow) m_tips_arrow->msw_rescale();
-    m_left_sizer->SetMinSize(wxSize(40 * em_unit(this), -1));
+    if (m_left_sizer) m_left_sizer->SetMinSize(wxSize(40 * em_unit(this), -1));
     if (m_mode_sizer)
         m_mode_sizer->SetMinSize(-1, 3 * em_unit(this));
     if (m_mode_region)