diff --git a/src/slic3r/GUI/CaliHistoryDialog.cpp b/src/slic3r/GUI/CaliHistoryDialog.cpp
index 61605e4ae9..615fc78734 100644
--- a/src/slic3r/GUI/CaliHistoryDialog.cpp
+++ b/src/slic3r/GUI/CaliHistoryDialog.cpp
@@ -368,7 +368,8 @@ void HistoryWindow::sync_history_data() {
         delete_button->Bind(wxEVT_BUTTON, [this, gbSizer, i, &result](auto& e) {
             for (int j = 0; j < HISTORY_WINDOW_ITEMS_COUNT; j++) {
                 auto item = gbSizer->FindItemAtPosition({ i, j });
-                item->GetWindow()->Hide();
+                if (item)
+                    item->GetWindow()->Hide();
             }
             gbSizer->SetEmptyCellSize({ 0,0 });
             m_history_data_panel->Layout();